Not had any real problems with any of the installations the engineers performed (either at current address or previous one). The only slight annoyance was that they tried to be too helpful and modified an existing BT junction box that was already there, so that we'd not have an unused BT one and the NTL one. When we ditched NTL for BT, however, this caused problems and BT had to send an engineer round to tidy it all up. BT said NTL weren't within their rights to modify their hardware, but I can understand why they did it, and they were trying to help after all.
Billing dept, however, cause me to have nightmares! But as long as I continue to take my pills, everything's fine