Unlike Ex-M, I've had no trouble with either of the machines I've upgraded; one of them a fairly standard Dell, the other I built from 'bits'.
'7 is quite a friendly beast; often the drivers for peripherals don't work, so it says 'hang on a bit' and goes off into t'internet and finds some for you. This can be an advantage. For example, the Windows-found drivers for my HP Laserjet are fine, HP's offering add all sorts of cr@p - heaven knows why. And I've only had two blue screens of death in 3 years, both due to faulty usb drives... much better than XP which I managed to crash quite regularly, mostly due to finger trouble, I expect.
I'd say, go for it.