I just got my Vista updated to its latest patch: Service Pack 1. Lucky for me reactivation is not required. I must say there are perceivable performance improvements. The system now feels more stable in its core and speedy in its performance.
This was almost the same for Windows XP. Before XP SP1 was out, everyone hates XP, let’s just say XP was just as crappy as Vista back then. But after SP1 XP became actually usable. If the pattern matches, we will see more people find vista to be a viable as a main system.