I used PC in the original IBM PC compatible meaning, also referred to as Clones.
Yes you can't install windows, I don't see how that's even a surprise, if you read any part of the review.
3g is locked to verizon, I can't forecast what they will offer in the future. It's fairly fast, I've been enjoying it in coffeeshops that do not have free wi-fi. 100mb per month is free for two years, then it's 20 for a gig, and 10 for each gig afterwards. Alternatively you can get an unlimited day for 10.