True, but at the same time I think most SP1 installations have gone OK. I did a trial on a corporate location last week, where I had to install SP1 to resolve an error message (MS had a hotfix for the issue, but it had been rolled up in SP1 and is no longer available for download). I worried that this might cause problems with some of the oddball software the client runs, so I did the initial installation on a single computer, and it was totally painless. I approved SP1 for installation on the other 22 computers running Win7, and I didn't get a single glitch. Big sigh of relief!