@absolut: i don't take that as criticism - but it may be interesting for your devs to know our reasons - and trust me, that i don't migrate from chili to redmine just for fun. Ruby can be real pain in the ass, especially if it come to older rails version, older ruby versions and so on. And chili was behind redmine after a real good start - ok, the finnlab guys make some great things with the new ui, it was an interesting approach with some not so nice aspects - broken plugins, broken workflow, but a new and shiny ui.
And thats the point - if one go with main development / upstream, one can trust, that the most important plugins will be developed for new versions - at least the chance is higher than for forks. I've seen that for chiliproject, over times a few very useful plugins (wiki extensions, time-tracker etc) break and no one fixed them. Annoying
Another point is, that one will use a bug tracking system on a daily base, it will be hard to impossible to change that if people rely on it. And it becomes harder every day it runs. Btw: It costs 12 man days until now to migrate back to redmine.