FedEx tried to deliver it today at 11:30 AM, but nobody was home to sign for it, so I went by the local FedEx depot on the way home from work and picked it up.
My 660ti is handling it just fine, via included DP cable.
Been using mine for a couple hours now... GLORIOUS. So clear and sharp, and it doesn't color-shift hardly at all (unlike my previous monitor). Using it for desktop work is exactly what I'd hoped - like two monitors stuck together.
Only tried a couple games real quick - CoD:WaW, Wolf N.O., Skyrim. All good, though the older ones (CoD and Skyrim) don't really do this resolution quite right. Wolfenstein looks incredible. And no problem with performance (I can see a tad bit of tearing occasionally, but that's OK). I didn't change any monitor settings, except for changing "response time" to "fast". Not much difference really, maybe a tad better, and higher contrast. Will have to test more. I'm pretty surprised my 660ti handles this so well, so far for games. Not sure how to adjust the screen to make 2540x1440 non-stretched though (would rather it be normal aspect ratio, and put black bars on left and right).
Looking forward to trying lots of other games, and tweaking.
Productivity-wise, I can see this is gonna be GREAT!