The only other drawback with Vista is that it is Vista.

More overhead, little to no compelling upgrades, worse performance. Useless Aero interface. Annoying and thus not very useful security features. Driver problems. 64 bit problems. No downgrade path.

In my opinion, it is still not ready for prime time. And will not be for at least 1.5 - 2 years.

But YMMV.