I've been thinking about 'upgrading' to that connection for a while now, Bike-it. But I've heardand seen so many posts like yours, I decided to hold off for a while in the hope it would improve or at least not be so bad here in N.Ireland. If I remember correctly, you're from Newry are you not?
I have also been looking at the Post Office HomePhone with Broadband Extra offering, it's along the same lines as Tiscali's. It's a little more expensive at about £26/month, but peace of mind means a lot, doesn't it? click here