I've been with O2 for a year and a half now, after jumping ship from the godawful over-subscribed behemoth that was Virgin Media.
I have the home broadband 'All Rounder' package, which with a £5 discount for having an O2 mobile, costs me £23 a month (was £20, but the price went up recently.) For this I consistently get around 10MB broadband (2-3 times better than the best I got with Virgin's fluctuating speeds) which is good considering I'm 2 miles from the exchange and plenty for my needs,
and no frills home phone, without having to fork out to BT for their over-priced line rental.
O2 keep you informed about service changes, billing and rare outtages (proactively - I received an apology for loss of service before I'd noticed there was one!)
Customer service is good. My broadband stopped working recently and I couldn't find the cause, so I contacted O2 customer services on their freephone number and after the standard automated selection menus I got straight through to a friendly Northern Irish support lady. I was expecting to have to wade through the usual bunch of stupid questions "have I tried turning it off and on again", but she got straight to the nub of the problem with minimal preamble. After determining my account was fine and the adsl at the exchange wasn't the issue, she traced the problem to the router and said they'd send me a new one (would I like the new upgraded model, or did I have a sentimental attachment to the older existing one? I opted for new and improved.) The call to customer services was at 5:25pm, by 10am the next day the new router had arrived by courier. Plugged it in and was back online in under 5 minutes.
Their account management website is easy to navigate and gives you plenty of info and options (compare with the labrynthine complexity and negligible accessibility of the BT account site.) Their 'My O2' connection monitoring/support software has a minimal footprint and can be uninstalled without impact on the service, but I find it comes in useful to resolve occasional connection hang-ups.
Overall I'm happy with O2, certainly a damn sight more than I ever was with Tiscali/Virgin or BT.
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