I think it's fairly similar, at least in philosophy. I always liked some parts of FogBugz - minimum number of required fields, always one owner and making it as easy as possible to get bugs in to the system from multiple places - and those all things I continue to think are important, and have tried to get in to Envoy. Ease of bug addition is critical, as without it you can't get management to use the system and it fails, so all accounts automatically have an email address they can use to send in bugs. I'm looking at ways to use the API to tie into other systems too to make the addition of bugs as easy as possible from other places.