I've not had any problems with my service from ntl, thats been over 4 years in 3 different houses in 3 different regions.
In fact thats a slight fib, I did have some problems with the ADSL package at my last gaff, but that was down to a ropey BT line
As pem says, people seem to have varying experiences.. mine have so far been quite good!
HTH.
