How do you compare to fogbugz and its philosophy?

I mean to invoke some reflection about this.

We hold fogbugz up as the sweet spot of get-things-done bug-tracking.

(As a JIRA user at work, I can say that the JIRA and bugzilla report-centric mandatory-required-fields-and-flow-centric approach is a horror to use, unless you're the manager)

http://www.joelonsoftware.com/articles/fog0000000029.html and think about how you can interact with fogbugz using email, how its free-form without required fields or custom flow and so on.