From my own experience with X on Windows 7, and judging from comments here, I'd strongly suggest avoiding Adobe Reader X until its ready for prime time.
It was taking me a minute to turn a page. Why release something like that? Seems to work better on XP-Pro, in my imited experience. Back to 9 for now.
Is Adobe serious? I think none of us fellow users knows, but many suspect that Adobe just doesn't care. And no, this is not a channel to address Adobe; only (or almost exclusively) fellow users around here...
Works fine for some, not so fine for others.
These forums are mainly visited by people with problems. Every version that comes out has it's share of people commenting on here. From the time I've been here, I can't say that X has caused any more or less issues than previous versions.