I have never liked Trac. I just don't like the user interface, the inability to use HTML if one wishes, some problems I encountered with cross-posting comments causing the slower writer (me) to lose their comment, and unquantifiable prejudice.
But everyone else at Agaric is for it, so for now we may try Trac+Git (a separate trac and a separate git repository for each client) for new projects rather than our Project module plus Organic Groups approach (which we will continue for most existing projects).