You couldn't pry my 2150 outta my cold, dead hands with a crowbar and a comealong...
I simply leave EVERYTHING on (Bluetooth, WIFI, Max Display Brightness, 10 Minute Screen Timeout, Frequent Syncs on 5 email accounts, FB, Weather, etc) and this thing never stumbles...
Tonight I've had all that plus have been syncing 12 Gigs of music via WIFI from my laptop (via TuneSync) and haven't given it a second thought...
I'm doing surgery on a spare Verizon silicon case tomorrow to fit it over the extended back, and won't look back...
(What makes this key for me is that I work 24 hour shifts. I used to have to keep a charger on the truck, one at the station, and make sure that I had one available when I hit the rack - I'm giving my wife my spare chargers for her droid!)