It installed easily on mine but wouldn't recognise the motherboard drivers from the CD. However updating just the wireless network controller from Device Manager was enough to get it connected to Windows Updates which downloaded everything needed. A lot of the drivers were actually included in the Win7 installation CD. I did a clean install.
It's slightly faster than Vista going by first impressions but benchmarks don't support that view. It's around 10-15% slower than XP.
They've sorted the wireless connection problem when resuming from sleep. Previously it could take anything up to a minute to reconnect, now it's just takes seconds.
I 'think' I like being able to pin items to the taskbar but miss the functionality of the toolbars. Pinned items take up too much space even when shrunk to the minimum setting i.e. without labels.
I like the neat way system tray items can be hidden, works better than Vista and XP.
I don't like the fact there's currently no option to select the classic start menu.
Eye candy is nice to look at initially (the same as Vista) but I turned it off after a few hours (the same as Vista).
It has been very stable but I've only had it running for just over a day.
In my view this should have been a Service Pack.