I've been with TalkTalk for 18 months, previously with BT for the phone and Orange for the (free) broadband
I had some initial issues with them, mainly that their Huawei router, which is OK but for some reason not good on Wi Fi with anything with an apple logo on it! (fixed that issue by putting their router into modem only mode, and using an airport extreme and an airport express as we have a considerable footprint in which to get the signal over!)
Apparently their customer service is shocking..... I have to confess I haven't had any dealings with their helpline (based abroad) as they also have a UK based forum which is quite honestly very very good, you'll find it at www.talktalkmembers.com
Price wise, I pay £7 a month for unlimited 18Mbps broadband, and anytime calls (yes, you did read that correctly) Line rental works out at £10 a month (or so) if you pay a year in advance, which is what I do (saves you £70 a year I think as opposed to paying by direct debit)
I hear horror stories about all telecoms providers, I think they are all much of a muchness, but if you want no frills and want to keep the bills down then TalkTalk are probably your best bet.