I take it you're on about broadband connections.
My brother is on Sky surf, speak and see or whatever it's called and thinks it's brill - he gets around a 6Mb connection speed. I've heard a lot about Orange being one of the worst providers...there was a report on watchdog rating them all. I've been on Tiscali the last year and have had no problems at all apart from recently my conneciton speed is virtually non existant in the evening. Before, I've had Bt and AOL and with both providers I've had an excellent service. AOL can be a bit tricky to leave though. But everything else was great.