Got mine last week
Have to say I'm impressed, its certainly more of a functional phone than a pretty phone with the default black back - but that's what I want. It feels solid and its perfectly fast enough for anything I need. My old Galaxy S had some flex, and the odd squeak from the case - this doesn't, its hard to quantify but physically it feels reassuringly solid.
The battery might not be "removable" but I've read a couple of teardown reports and its certainly replaceable - the inner cover comes off with a few screws and there is only light glue holding it in place. I don't need to swap batteries during the day, but I do object to throwing away a device if the only fault is that the battery isn't holding charge.
Yes an SD slot would be nice, but with the 16GB model I cant honestly say I feel stuck for space (although I personally would find the 8GB model hard to live with)
The Motorola migrate app also worked pretty well, so for an average user the migration should be pretty painless.
Having used CM 9/10.1 for the last year stock android is what I'm used to - and frankly seems a lot nicer than the bloat overlays that other manufacturers put in. The oddest sensation I've got therefore is that it looks almost the same as my old phone, just fractionally bigger, a little heavier and a lot faster.
All in all it seems a really good handset.