Yes, I think it's probably best to wait for it to appear on windows update. I'm just one of those people who likes to try new things though. However, erring on the side of caution, I've only tried it one pc and despite the initial hitch it seems to be fine (he says).
On a whim I decided to install Vista SP2 onto my dual booting desktop, the download went smoothly, the installation went well and it re-booted into my normal screen. So far so good and then I did a manual re-boot and all hell broke loose.
Instead of booting into Vista I was greeted with a white on black message saying that CHKDSK needed to run and I would be advised to let it do so, so I did. After doing all its checks I was left with a message at the very end (5 minutes later) that there was insufficient space for the MFT and that CHKDSK was stopped.
But up came my desktop and all seemed well except none of my internet browsers would work, lots of messages from programmes saying that I needed to run CHKDSK, so I did. Again and again and again. I even tried the XP partition but got exactly the same message (this time on a nice blue and white screen).
Finally it seems to have cleared itself and CHKDSK has completed its checks and presumably fixed the 13,931 errors where it needed to "Insert an Index Entry with ID SDH and SII into File 9" - whatever that means. So far it has booted up cleanly twice and I am keeping my fingers crossed, incidentally adding SP2 wiped out all my Restore Points.
I think that I will wait a while for the official update before I put it on the wife's laptop!