Normally SF doesn't cause any serious issues, but I noticed a couple of problems that arise on my system when I have SF installed.
They're mostly just absolutely irritating inconveniences:
My DVD drive will only work once with each system boot; if I use a disc, I'll have to restart before the drive wiill recognize any other disc after that. It's f&$^ing annoying. The second thing is sometimes it just becomes a CD drive, and doesn't recognize DVD's at all, until I reboot. Uninstall SF, and the drive works normally.
Conclusion:
Starforce can pre-suck my genital situation.
I'm not too concerned with Vista issue, because 1) I don't plan on using Vista, and 2) since it is a pretty big issue for Vista it only means that SF will be obliterated. That's about the only issues I've had with SF, other than that I agree with Que, I have ideological issues with its methods.