I've had it installed on a bunch of corporate boxes and never used it and I'm not sure if anyone used it.
Even though it's a bit crash happy on windows and the gtk file picker sucks on windows for my uses meld was the most useful(at least now they have a packaged version for windows - http://sourceforge.net/projects/meld-installer/ - so you don't have to package it yourself). It's simple, good looking, highlights the difference between 2 slightly modified lines, has support for comparing directories, and allows in-place editing.
I can vouch for the rest too....ConEmu especially is very very nice.