Battery life seems a little lacking, but will see if it evens out with some time.
I'm a pretty heavy user and I think I could go the whole day without charging. If a batter can last me one day, I'm happy. There are two X2s in our household, so, I nabbed four of these.
Amazon.com: This Battery is 1500 mAh.: Electronics
They are "new." They seem to hold a good charge. Maybe about 75% as much as the one that came with my phone. But, since they are "new" I guess you can't really know for sure. Still at five bucks, you can't really beat it. And, if I'm going out for the day and I know I wont be near a place I could charge my phone, I'll just throw a couple of batteries in my bag.
Also, here is an extended battery.
Amazon.com: Motorola OEM Droid X / MB810 Extended Battery BH6X: Cell Phones & Accessories