Had the 2mb IPstream, 8mb LLU and now ADSL2+ service with them so I guess I'm probably qualified to talk about them lol
8mb service was absolutely flawless, rock solid connection, and great pings. Not much more to say about that.
22mb (19,500 kB/s in reality for me) has been touch and go so far. The Netgear that make you purchase isn't regarded as the best router on the market and it's locked up a few times on me. A quick router restart always does the trick. ADSL2+ pings are also some 30ms higher due to the default Interleave mode they use. I asked nicely and they promptly switched me to Faspath which saw my pings back down in the 13ms region. I've now purchased a Billion 7402 VGL after a lot of people have found significant improvements due to the chipset used in it.
As for the company rather than the service I have had some problems with them. My 8mb activation took 4 weeks and I was promised (yes actualy promised in writing) that I'd definately be activated on 3 seperates dates which all came and went.
If you need to know anything specific just ask.