I bought a Nokia Lumia 610 with Windows Phone 7.5 a couple of months ago, after killing my last phone (and looking for a cheap replacement; I guess it was cheap as the Lumia 620 with WP8 was just about to arrive).
It's my first touchscreen phone and I've been pleasantly surprised by how good it's been so far.
The only downsides are that the compulsory Zune software, which is limiting as it's the only way to transfer some files, and seemingly doesn't work properly with Windows 8 (it's supposed to be able to synch wirelessly and won't). Also it's not a brilliant phone for apps, due to low memory (and Microsoft still a way to go to build numbers in their app Store).
But overall it's pretty good and a bargain for what it cost me.