Presumably they've also tied you in to another 12/18 months contract too? (If they've moved you to an unbundled - non-BT - line, they've also tied you in to their world forever unless you pay a fee - I think it's about £50-60 to migrate back to BT so you can choose your ISP from a cast of thousands once more)
I have to say that for me and my work-from-home colleagues at work, there were 4-5% that signed to Tiscali (we have a choice) and guess who were the ones experiencing issues? All the Tiscali folk, most of the TalkTalk folk (and Tiscali is now TalkTalk).
The Church of Scotland holy person (no idea what the correct title is - perhaps Ollie knows?) up the road used extremely irreligious words in regard of his Tiscali connection (to the Tiscali "help" desk) not long after we moved in here (he called on me as a known techie in the street), because my GPRS connection (43.2kbps) was actually more reliable and faster than his 8M Tiscali connection... They let him out of his contract because they admitted they were unable to supply what he'd contracted (conversation recorded and used in evidence when he asked to quit).
Notwithstanding that - if it works for you, great!