Just got from Verizon. Good thing I left my wallet at home.
The guy was good. Answered all of my questions. He was surprised that the new Motos block app to SD since his older Droid doesn't. We checked a couple of the phones and they were all blocked out of the box. The 4g signal on all of them were comparable to my Thunderbolt in the store. I meant to make some calls to check sound quality but forgot.
He said he's not a Samsung fan (though he loves the Note that's being released tomorrow...just too big for me). He said the bulk of the phones they get back are the S3. I also looked at the DNA. It's slightly larger but considerably lighter than the TBolt and it was screaming fast with the quad-core processor. I can see how the battery life is so much better. I believe the M is a 2400 mAh batt and the DNA is 2040 or something compared to the 1400 on the TBolt. He also said the newer phones are more efficient which isn't hard to believe.
So the long and the short of it is that I think I've swung away from the M but the journey continues.
ETA: Crud. The salesman was wrong about the DNA. No SD card and only 16GB internal. My TBold SD is filled to 29GB. Back to the drawing board.