I use it and I like it. I replaced Lucida Grande with Tahoma as I think Tahoma is an excellent font for on-screen text. It is IMHO better readable at smaller text sizes which is cool for list and column view in Finder, and since it isn't as wide as Lucida Grande at the same size, PB's menu items don't collide with menu extras any more.

A slight annoyance is that text input fields (e.g. browser address fields) show Tahoma while typing and Lucida Grande when clicking outside them.