I've used A&A previously at home, and currently use their Office::1 product, which is highly resilient.
The way their services are put together is very impressive - high quality due to low congestion, and well thought out in case of Office::1 (you get everything in one box, pre-configured).
Probably the most outstanding thing is their tech support - you can get through to someone very quickly on phone or IRC, and get useful responses by email, and they can do almost anything reasonable to sort out the problem.
A&A are also particularly good at working the BT 'system' - whether for faults, underlying speed issues, or moving a home/business line.
They recently gave great support even at weekend for a new order which was particularly challenging, involving a home move.
Overall, a bit more costly than some options, but you really do get what you pay for - ideal for business or people who work from home and need a reliable connection with great customer support.
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