Mostly speed is better and though finding drivers may be a problem now -- at least there's a chance they'll be produced. Unlike Vista which most manufacturers had no faith would last long enough to be worth the investment.
I'm using win7 currently and loving it. It's user friendly; very helpful in alerts for all situations including unsafe websites and is most definitely on "a train going somewhere" as opposed to vista. Drivers have NOT been a problem; in some cases vista drivers work well enough in win7. Every day I see a whack of new drivers available for win7 and it would seem to be a welcome and reliable trend.