I have the Galaxy myself. It's a pretty awesome device, although some things are done in ways I had a bit of trouble getting used to as a long time Nokia user (placement of settings for various things, the messaging system in general, etcetc)... Now that I'm used to it though, it's really nice.
The only two real problems I have with it are as follows:
1. The battery life. Even if it's inactive with Wifi, GPS and 2/3G turned off, it'll run out of battery in a little over a day. Might not be a huge deal for some people, but I went from charging my very basic phone once a week to charging basically daily... Bit of an adjustment and I doubt the battery will live very long.
2. Don't know if it's my old SIM-card or what, but I had to actually manually set some setting that no phone manufactured after 97 has ever had any trouble finding from the card. For example the message center number was way off and needed to be set manually for SMS to work.