We looked at FogBugz as a replacement for RT, but it had some severely opinionated limitation on release flow/version numbers that meant it didn't fit our exist

We looked at FogBugz as a replacement for RT, but it had some severely opinionated limitation on release flow/version numbers that meant it didn't fit our existing product releases, let alone our future plans. (I think we were pretty interested in it for the UI and the dynamic velocity modelling? But the presentation/demo pretty much ended with the "so don't do that" discussion :-)