I switched to Post Office yesterday for BB+line rental+ eve/w/e calls and so far I am very pleased. The whole process was painless, with good communication from Post Office all the way. The router was preconfigured so was a doddle to set up.
And now I can get 5-6 Mbps all the time (my line max is 8). I was with AOL previously, whose service had got so bad I was only getting 0.2-0.3 Mbps most of the time.
The Post Office section of this forum is fairly inactive - I can only take that as a good thing.