The few technical problems I had at the start of my Broadband contract were sorted out very quickly and the technical support staff were very friendly and responsive. That's been my experience of NTL, not saying it's that way for everybody.
Going back to the offers at
http://www.solo.pipex.net/xtreme-sol...3725c2093092c6 the same package solo 500 is £23.44 whereas it's £24.99 with NTL. Hardly earthshattering savings is it, and not enough reason for to change i'm afraid.