(I've had this phone for 2 1/2 months now.)
Great phone: call quality is excellent, Android 2.1 runs very fast and smooth, small(er) size (perfect for my uses), touchscreen *very* responsive, really nice sound chip.
Wifi and Bluetooth work very well, day-to-day, and I use them pretty much every single day, much more than I actually make calls.
Pairs and interoperates beautifully with my Plantronics 300 Bluetooth stereo headphones -- they are *awesome* with this phone, incredible call quality and music listening.
I really, *really* like the "semi-rugged" features of this phone, e.g., not having to be paranoid when it rains, not worrying about scratches on screen (I usually work outdoors).
I don't use Motoblur, disabled what I could of it, I prefer to use Launcher Pro home screen (from Android market), because of the features, but this also means that I don't have to see all the Motorola/T-Mobile stuff that came loaded the phone. But I might use all the social stuff someday, so I haven't deleted it.
Electrophones (the Amazon seller I got this from) shipped promptly. I was, to be honest, a little surprised with the minimal and non-Motorola/non-T-Mobile packaging -- just a shipping box, charger, bubble wrap and manual. Less for me to toss out, though. ;)
This phone was *not* unlocked, but I found out (by chance, actually) before ordering, and ordered anyway -- at that price, I could always get T-Mobile to unlock it if I really needed to.
But actually, this has worked out for me. Since I already used T-Mobile prepaid SIM anyway, if there is no Wifi or Clearwire coverage, I can use T-Mobile daily web rate ($1.50/24hours at time of writing, and I think 300MB). If the phone was unlocked, I couldn't do that -- I've tried with an unlocked MyTouch 3G.
Very happy with purchase.