I owned one for a while.
It was made to do several things in a small space (for cramped pedalboards), and it's
great by those standards.
The modes are all on toggles, so it's not easy to switch on the fly--switching modes can cause some volume changes, which make it a bit difficult to switch on the fly.
So for home-playing, studio-playing, it works well, but it's not a quick-switcher.
I also thought the boost mode was one of the best boosts I've heard (added a bit more noise than I'd hoped, but just
very sweet sounding)...also, the boxy fuzz and fuzz-with-boost was great! Some of the other combos had too much noise for me (but not for most of you guys!

).
BUT--for doing a lot of different things and fitting it all in a small box, it's pretty impressive. And the internals are really nice.