Finally bought one because they're $25 from Verzion. Right now at 21.5 hours with 60% left. I'll admit I was fairly light on using the phone today but still nice. My regular battery wasn't too terrible, it would usually be dying right around when I was ready to go to bed. Was plugging it in almost every night, if I didn't it would usually be dead when I woke up. I actually like how it makes the phone feel. I didn't like the Razr because of how skinny it was and the Bionic with the TPU case on it was at least a little better, but with the extended batt/door on it really suits me. Most people probably want their phone as thin as possible but I actually like it this way. I think I actually like the added weight as well. I just sold an HTC HD2 that belonged to a relative and I liked how hefty that felt. Now my Bionic is almost like that. Saw some "Extended battery cases" on eBay that were simply TPU cases with part of the back removed so the door would poke through. Saved myself a few bucks and took a pair of scissors to the TPU case I already had and it works fine.