Since around April, the time I changed from BT to Digiweb's 3Mb DSL, I have had a very consistent connection regardless of the time of day or night. If I run the speed test here using a wired connection to the router with no other transfers taking place, I usually always get 2.62Mbps down and ~320kbps up. At this time of writing, I got 2.62Mbps down and 323kbps up. Compare this to my
previous "3Mb" DSL provider 
Quality of Service is usually 99% and I have so far yet to see it fall below 90% (with no transfers taking place).
I have used their support a few times for a few queries and so far despite all the support issues I’ve heard about their wireless, I’ve at least found their DSL support polite and helpful and usually always get through with no more than 5 minutes on hold.
The only drawback I found with their service is the way they measure usage (past 30 days instead of from month start), but usually I seldom get near the 40GB allowance and so have not exceeded it.