I'm in the same boat. I have to use Outlook for work, but I use TB for pretty much everything else (and still import my work cal to make sure I have a 'master'

I'm in the same boat. I have to use Outlook for work, but I use TB for pretty much everything else (and still import my work cal to make sure I have a 'master' view of all my time since I work from home mostly anyway). It's punchy, has decent (not awesome) UX, is easy to set up, and doesn't act like a memory leak with a UI.