I'm a long time LaTeX user and have a pretty efficient workflow already set up for writing LaTeX document, however I've pretty much missed the entire wave of "alternate" and "enhanced" LaTeX replacements like LuaTeX and XeTeX. I've been wanting to try out a new typesetting engine, but am interested in making a switch only to something that I can keep using long term.
For someone writing for the sciences, what would be an efficient path to switch from LaTeX, minimizing the dip in productivity? Particularly, how well do existing LaTeX packages (of most interest - publisher specific packages like
revtex) interface with LaTeX alternatives? Are there any distinct advantages that someone writing for scientific publication or engineering documentation would find useful in other *TeX's ?