Here's a BIG HUGE "NO" for Remedy. It's still in use at ATI and I had the displeasure of having to use it while working QA. I don't work in QA anymore so I avoid it like the plague.

I've been using Mantis more recently for something completely unrelated and it's decent so far. Though I didn't set it up myself and it's only lightly beeing used right now.

Bugzilla looked like it was going to be far more trouble than it was worth.

Bruno