Nothing short of AWESOME! ;-) Rated 5 out of 5 stars
Had this installed on FF 3 (finally gave up on 4 ~ too many bugs), two days ago. It seemed pretty strange at first, but after two days, I'm wondering how on earth I ever worked well without it. I've had zero problems with it. Not too crazy about some of the styles. Mixed seems to work best.
This thing makes it so much easier to find the tabs. I also use Window and Tab Limiter. When it hollers at me to clean up my tabs, I don't use WTL to do it anymore. Now I use Tree Style. Clean up is now a breeze with this thing!
Feature request: put a tab limiter in it. Heck all I need is a nag window with a tab limit I can set myself.