Simple TikZ diagram - help needed with several issues

Question

I would appreciate some help with several issues I'm experiencing with a diagram. I'm building this diagram in LaTeX/TikZ for my dissertation defense slides (Beamer); the diagram reproduces my original adapted version of the updated DeLone and McLean model of information systems success, which appearance I don't like and find the LaTeX quality much more pleasing to eyes.

Above is the original model diagram I'm trying to reproduce. Below is my current LaTeX/TikZ version.

Here's the corresponding LaTeX code that I came up with:

\documentclass[12pt]{beamer}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{tikz}
\usetikzlibrary{mindmap, trees, shadows, shapes, calc, fadings, positioning, decorations.pathreplacing, intersections}

\usepackage{palatino}
\usetheme{Boadilla}
\usecolortheme{orchid}
\useinnertheme{rectangles}
\beamertemplateshadingbackground{gray!5}{gray!20}
\setbeamertemplate{navigation symbols}{}

\begin{document}

\begin{frame}{\small{IS Success: Updated DeLone \& McLean's (2003) Model*}}
  \centering

  \scalebox{0.8}{
    \begin{tikzpicture}[node distance = 1cm] % , auto

    % Styles (TODO/LoPri: switch from 'tikzstyle' to 'tikzset')
    \tikzstyle{construct} = [rectangle,
    ultra thick, rounded corners,
    draw=blue, fill=blue!20, minimum height=1.25cm, minimum width=3.2cm, align=center, inner sep=0.5em]
    \tikzstyle{smallconstruct} = [rectangle,
    ultra thick, rounded corners,
    draw=blue, fill=blue!20, minimum height=1.25cm, align=center, inner sep=0.5em]  \tikzstyle{arrow} = [ultra thick, ->, >=stealth]

    % Nodes
    \node[construct, anchor=mid] (InformationQuality) {Information\\Quality};
    \node[construct, anchor=mid] (SystemQuality) [below =1cm of InformationQuality] {System\\Quality};
    \node[construct, anchor=mid] (ServiceQuality) [below =1cm of SystemQuality] {Service\\Quality};

    \node[construct, anchor=mid] (UserSatisfaction) [above right =-0.10cm and 1cm of ServiceQuality] {User Satisfaction};

    \node[smallconstruct, anchor=north west] (IntentionToUse) [above =1cm of UserSatisfaction] {Intention to\\Use};
    \node[smallconstruct, anchor=mid] (Use) [right =0cm of IntentionToUse] {Use};

    \node[construct, anchor=mid] (NetBenefits) [right =6cm of SystemQuality] {Net Benefits};

    % Arrows
    \draw[arrow] (InformationQuality.east) -- (IntentionToUse.west);
    \draw[arrow] (InformationQuality.east) -- (UserSatisfaction.west);
    \draw[arrow] (SystemQuality.east) -- (IntentionToUse.west);
    \draw[arrow] (SystemQuality.east) -- (UserSatisfaction.west);
    \draw[arrow] (ServiceQuality.east) -- (IntentionToUse.west);
    \draw[arrow] (ServiceQuality.east) -- (UserSatisfaction.west);

    \draw[arrow] (UserSatisfaction) -- (IntentionToUse);
    \draw[arrow] (Use.south) -- (UserSatisfaction);

    \draw[arrow] (Use) -- (NetBenefits);
    \draw[arrow] (UserSatisfaction) -- (NetBenefits);

    \draw[arrow] (NetBenefits) |- (IntentionToUse);
    \draw[arrow] (NetBenefits) |- (UserSatisfaction);

    \end{tikzpicture}
} % end \scalebox

  % old way
  %\includegraphics[scale=0.98]{images/DeLoneMcLeanUpdatedModel}

  \vfill
  \flushleft \tiny *Adapted from “The DeLone and McLean model of information systems success: A ten-year update.”,\\ by DeLone and McLean, 2003, \emph{Journal of Management Information Systems, 19}(4), p. 24.\\ Copyright 2003 by M.E. Sharpe, Inc. Adapted with permission.
\end{frame}

\end{document}

I need help with / advice on the following issues (thank you in advance):

1. I'm not sure how to specify a complex (more than one turn) path for arrows from Net Benefits to Use (north, west, south) and User Satisfaction (south, west, north), correspondingly (I've tried things like '|-|', but TikZ didn't "like" it);

2. I'm not sure what directive/command could I use to force arrows, originating from first column's boxes, arrive to second column boxes' sides not to a single place (in other words, I want to spread the ending tips of those arrows along the left/west side of corresponding boxes);

3. What is the reason of a horizontal shift between Intention to Use/Use and User Satisfaction boxes and how to fix that? A bonus would be a more elegant, but simple, way to ensure the same width of those boxes - as you see, I hardcoded the value; I've tried some approaches, hence construct and smallconstruct styles I've created, but haven't succeeded so far.

Answer 1

Well, this is a bit of a hack.

1. To make the width of User satisfaction and Intention to Use|Use the same I have used minimum width.
2. I have used xshift and yshift to adjust the placement of the arrows.
3. I have changed the anchor to east and west in many cases.
4. I have tweaked the spacing...
5. The horizontal shift that you refer to in #3 is almost certainly caused by the horizontal shift in the above right=.... Not sure why. To counteract this I have added another horizontal shift in the above right=... for the "intention" box. I found an appropriate shift by trial and error...

The code:

\documentclass[12pt]{beamer}

\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{graphicx}
\usepackage{tikz}
\usetikzlibrary{mindmap, trees, shadows, shapes, calc, fadings, positioning, decorations.pathreplacing, intersections}

\begin{document}

\begin{frame}{\small{IS Success: Updated DeLone \& McLean's (2003) Model*}}
  \centering

  \scalebox{0.8}{
    \begin{tikzpicture}[node distance=1cm] % , auto

    % Styles (TODO/LoPri: switch from 'tikzstyle' to 'tikzset')
    \tikzstyle{construct}= [rectangle, ultra thick, rounded corners, draw=blue, fill=blue!20,
               minimum height=1.25cm, minimum width=32mm, align=center, inner sep=0.5em]
    \tikzstyle{smallconstruct}= [rectangle, ultra thick, rounded corners, draw=blue, fill=blue!20,
               minimum height=1.25cm, align=center, inner sep=0.5em]
    \tikzstyle{arrow}= [ultra thick, ->, >=stealth]

    % Nodes
    \node[construct, anchor=east] (InformationQuality) {Information\\Quality};
    \node[construct, anchor=east] (SystemQuality) [below=1cm of InformationQuality] {System\\Quality};
    \node[construct, anchor=east] (ServiceQuality) [below=1cm of SystemQuality] {Service\\Quality};

    \node[construct, anchor=east,minimum width=42mm] (UserSatisfaction)
                [above right=-3mm and 14mm of ServiceQuality] {User Satisfaction};

    \node[smallconstruct, anchor=east] (IntentionToUse) [above right=1cm and -43mm of UserSatisfaction] {Intention to Use};
    \node[smallconstruct, anchor=east] (Use) [right=-1mm of IntentionToUse] {Use};

    \node[construct, anchor=mid] (NetBenefits) [right=66mm of SystemQuality] {Net Benefits};

    % Arrows
    \draw[arrow] ([yshift=1mm]InformationQuality.east) -- ([yshift=2mm]IntentionToUse.west);
    \draw[arrow] ([yshift=-1mm]InformationQuality.east) -- ([yshift=2mm]UserSatisfaction.west);
    \draw[arrow] ([yshift=1mm]SystemQuality.east) -- (IntentionToUse.west);
    \draw[arrow] ([yshift=-1mm]SystemQuality.east) -- (UserSatisfaction.west);
    \draw[arrow] ([yshift=1mm]ServiceQuality.east) -- ([yshift=-2mm]IntentionToUse.west);
    \draw[arrow] ([yshift=-1mm]ServiceQuality.east) -- ([yshift=-2mm]UserSatisfaction.west);

    \draw[arrow] ([xshift=-2.4mm]UserSatisfaction.north) -- ([xshift=3mm]IntentionToUse.south);
    \draw[arrow] (Use.south) -- ([xshift=15.5mm]UserSatisfaction.north);

    \draw[arrow] (Use.east) -- ([yshift=1mm]NetBenefits.west);
    \draw[arrow] (UserSatisfaction.east) -- ([yshift=-1mm]NetBenefits.west);

    \draw[arrow] (NetBenefits.north) -- ++(0,2.2) -| ([xshift=3mm]IntentionToUse.north);
    \draw[arrow] (NetBenefits.south) -- ++(0,-2.2) -| ([xshift=-2.4mm]UserSatisfaction.south);

    \end{tikzpicture}
  }

  \vfill
  \flushleft \tiny *Adapted from “The DeLone and McLean model of information systems success: A ten-year update.”,\\ by DeLone and McLean, 2003, \emph{Journal of Management Information Systems, 19}(4), p. 24.\\ Copyright 2003 by M.E. Sharpe, Inc. Adapted with permission.
\end{frame}

\end{document}

The output: