Love so far - I wear a 7 1/2 or 8 in 'regular' shoes and purchased a 9 in these as my feet swell considerably in long runs over 10 miles. You should take distance into considertion when purchasing your size. Whereas I can wear 1/2 size bigger in shorter runs (3-7 miles), they don't cut it over 10, and my toes would start to go numb.
These are super comfortable, but I don't think they're a 'miracle' as others as said. I don't notice a big difference over my previous Mizunos or Brooks, but I do love them.

UPDATE: I changed my mind a bit, these are really wonderful, just ran my longest run ever (16 miles) and I have no after-run knee pain or foot pain like I often get with even shorter runs. These shoes did not feel strange to me as some reviewers said, they felt normal. There was no breaking in time, my favorite shoes met with an accident right before a 1/2 marathon. I wore these only once before that for 6 miles, and then for the 1/2. No problems whatsoever. You will love these - but shop around, I got the for less than Amazon is selling them for.