Makes your Treo a bit wider, and may have problems with car kits and cases
I use this on the Treo 650. Although the form factor is a little bit different, it's the same battery. If you are a real power user (internet, media user, game player, email, oh yes and phone), you have got to get this battery.
I can do all of the above, all day long and no worries about running out of juice. The battery is a but expensive...I do wish is was about $20 less expensive. Though, if you have a few bucks, you won't be disappointed with this battery.