I'm not surprised by that crewmeal, and I knew that was a likely situation. Added to which I live at the far end of the exchange so I get a pretty poor download rate. Anyway, it's done now.
All in all it works well, and I haven't found any problems. I quite liked 'Notes' being integrated with mail. I like messages (I had the beta version for a month or so just for fun), and I'm not convinced that I will use 'reminders' as I set reminders in ical. The new Safari layout looks good, and works well. The real benefits might be more apparent when IOS 6 comes out for iPods and iPads later in the year.