Hi,
same reasons for me, too.
I tested 7 for a short time because work goes ahead, but what I´ve seen was really good.
I installed it on an older machine, something like AMD Athlon 2400+ (1,8); 2G DDR; 80G IDE, and it runs much better than supposed!
A few bluescreens until correct drivers werde found and after that was done it runs and runs...
I think it´s time for a change (after sp1 )