I traded my Blackberry curve in on the Mesmerize mid January and after two weeks of cussing the touch screen I was hooked. Never looked back! Two of my co-workers ran out and bought their own within a week. We are "stuck" with Uscellular due to work paying us stipends to carry a USC phone.
I was happy with 2.1 and just used it after 2.2 came out. Then when I saw how fast 2.3 followed I went for the upgrade, did it myself and it really is not hard at all if you follow the few steps.
Backup
remove SD card.
Charge phone to 100%
Download software onto a good computer with NO firewalls or antivirus running.
In about 20 minutes you will have your update!
I lost nothing. Even my ringtones still work, just put the SD card back in after the upgrade.

I'm not into rooting, or hotspots etc; just looking for tips and apps that make the phone more user friendly.
I'm not wild about the media interface with Gingerbread, might have look around for another one.