Ok... I have cycled both of them once or twice. One lasts a little longer than the other. The good one battery lasts about 6-8 hours, when comparably I could probably get 8-10 hours with my stock battery. The other seems to last 6 hours or so. I can't say my usage pattern has been normal lately so a little hard to be sure on how good they are. Overall, comparable at best to stock, but for 2 batteries, and the external charger, I am satisfied fro $25. So if you were looking to pull the trigger, its worth $25. I always carry a spare with my now, it is kinda nice, because now I just do whatever I want without regard to battery usage.
By the way, I am in Chicago, 4g everywhere, all the time, and am running BAMF Preview 4 on the MR2 radio. I sync an exchange account (push), one comcast account (updates every 2 hours), plus weather syncs every hour. I usually do web browsing, email, couple phone calls, and a bunch of scrabble and XDA browsing.
