I can add myself as a member of the Happy Sky Broadband club. Apart from a weeks delay on my activation day, which I was aware of, it's all gone smoothly. Got the router two weeks before activation, migrated over and now hitting speeds around the 10MB- 12MB mark. All for a tenner!
The one peice of advice I can offer is if your order is in with Sky, regularly phone Sky to check on its progress, maybe every couple of days.
Just as an aside - If you want to check your speed I'd recommend this no frills test as it seems to give an accurate indication of your download speed (I've found the speed test sites a bit random but that may be because I'm on a Mac and some Java based applications can give erroneous results for us Mac users):
www.btopenworld.com/speedtest
spcdust