I like it....
Got mine delivered a few weeks ago, and have had no problems (T-Mobile slashing data limits notwithstanding!).
A few points:
>Samsung have a proven track record of "Release and Retire" for high-end handsets. They pump out new models quickly, forget old ones (by months, not years) which get no updates, and their support is notoriously horrid.
Software is released by google directly - other than the lettering on the back, there is no mention of Samsung elsewhere on the handset.
Battery life... I'm a "heavy user"... It's a phone, an email client, an mp3 player, a portable games system, and I get around 18 hours from a charge. Not fantastic, but better than the last generation of Android handset. Don't expect Nokia-like weekly charges though.
The screen is fantastic. The contrast between black and colour is immense - you can safely leave the screen on its dullest backlight setting and read the screen in daylight - saves the battery too.
Only cons are: the quality of plastics used. Feels a little cheap, and the smooth shiny plastic casing easily slips out of your hand (unlike my HTC Hero with a rubberised backing).
And the lack of SD card. I tend to uninstall apps I don't use, delete music once I'm bored of it, and I don't watch movies on my phone. 16GB should be ok with me, but I can't see why Google/Samsung aren't releasing a 32MB "professional" version.
Oh, and Mac user worrying about syncing... love the cloud. Transferred my phonebook, email and calendar to the device within 30 seconds... by signing into my Google account.