I run two Virgin connections at opposite ends of England, and have had no problems at all. They also don't have a minimum sign-up contract, so you can try for a month, and if you don't like it... walk. They supply a modem and two asdl dividers for you, and they give you a running commentary on how far they've progressed with your connection.
Service over 1 year has been 100% on both lines.
So, add my pennyworth to the Branson camp! (He probably needs the cash ;)
I know only three users of BT Broadband, one business two standard. None of them have had a working service or satisfactory support so far. Maybe they have just been very unlucky, but it certainly puts me off. Using F2S at the mo', have been for just over a year and very happy indeed. Of course, if things go downhill at any time as a result of the buyout I'll go elswhere since there's no contract involved.
Been on BT Broadband since they first launched ADSL. In those days they charged £39.99 pm for a 512 service plus £150 for an engineers visit ! Since then - about 5 yrs - I've seen it go to 2 meg for £29.99 with a 40 gig cap, tho they say in practice they won't enforce this. In that time I've only had outage for a few days due to a wiring fault in the flat which a BT B engineer sorted. They knocked me off 2 months rental. Cable has never been an option and I always felt that as the ADSL ISP's all had to go thru BT I might as well stick with them and have never regretted it. As local loop unbundling rolls out this may change but but so far I havn't minded top dollar prices as they've given me td service.