Experience with ConTeXt and/or LuaTeX?

Question

TeX

There are arguments to support the use of ConTeXt as an alternative to LaTeX. A lot of good things also speak in favor of using XeTeX or LuaTeX.
I ask the community to share their experience of using and practical advice (and, possibly, relevant articles) on the subject of the issue of using ConTeXt, as well as LuaTeX.