Seidio case works fine. it's not a snug fit but unless you intentionally tried to knock the phone out of the holster, i dont see it happening.
+1 on the finding hard to find the power button.
overall, it's a good battery. Here's a example of my battery usage -
unplugged it at 8am, then hopped on a bus from Shady Grove, MD to Pittsburgh. along the way, there are a lot of weak sections for cell coverage. i played angry birds for a good 90 minutes, about 30 mins of web surfing, and texting in between. @ the nhl winter classic, i had some issues with sending some txt messages. after power-cycling the phone twice, the txt messages started working again, but when i was having this issue, i lost about 10-15% of battery juice.. why? i'm not sure.
midnight comes around, i'm back on my pager and heading back to Maryland from pittsburgh, got home, still had a good 20% left on the battery. this includes using my phone on the way home for some more internet addiction feeding.
with the original battery, it wouldve been dead when i got to Heinz Stadium.
btw, outdoor classic.... that was just awesome. giggity.
buy the battery.. it's cheap and comes with a cover. compare it to a battery you buy from Sprint, it's going to cost quite a bit more.
-B