I've been with A & A for approaching six years and have always found them to be an excellent ISP - their technical support is brilliant (and is UK-based, unlike some other ISPs) and their sales support is extremely helpful.
Previously I had an ADSL2+ service, which ran at near the maximum possible speed for that technology, but recently I decided that I was paying more than necessary with line rental from BT plus the Internet service from A & A so I decided to get A & A to take over the incoming line (an overhead copper pair) and to make the transition to A & A's VoIP service so I placed the necessary orders with A & A.
It transpired that in order to move to VoIP I needed to migrate from ADSL2+ to VDSL/SOGEA; the changeover occurred on 3rd September. The OpenReach engineer arrived and did the necessary work, and within an hour my line was running with VDSL at around 75Mbps down and 19Mbps up. Since then the line has gradually retrained and is now running at 80Mbps down with 20Mbps up, and unlike before it seems to be perfectly stable without any line drops - this is more important to me than absolute speed.
Overall, I can't praise and recommend A & A highly enough - they are a truly excellent ISP.