[Ebonyks]

I bought one of these a few weeks ago, and it seems to be working well, but it has a few problems. The pre does seem to run warmer with it in (which is palm's official reason for not recommending non approved batteries), but the battery now lasts just about all day. On the con side, the back cover is a bit lacking. It covers up parts of the camera so the corners of the shot are cut out, and the flash becomes useless. Also, the cover will fall off the phone if it is dropped. The glossy back feels almost identical to the stock backing material-wise. The cover itself is thicker though, measuring just about a half inch total. I've never used a touchstone back, so I can't comment on it.

Still, for 20 bucks, I doubt anyone was expecting anything great. The battery life is obviously much better than stock pre though, and i'm glad I purchased it. No problems yet after a few weeks of use.

Edit: An update on this battery. The battery just about instantly dies as soon as the phone hits 10%. I suspect the reason for this is a chip inside of the battery that disables it so it cannot discharge below the threshold for lithium ion batteries. I have not directly measured the battery life, but i suspect competitors have superior results. Still, you get what you pay for, and this is no exception. I still am glad I purchased it.