Been with them for a few months now.
Positive points:
Connection seems fairly stable and getting around 2.5mbps sync on a non-LLU line here which is pretty good.
Negative points:
They completely screwed up our order, and sold us the wrong thing totally. We were sold the Plus package (Wireless N router, LLU Broadband, Anytime calls etc) but they screwed up. We couldn't get LLU here at the time so they helpfully moved us to the Essentials package (without telling/asking us!) where we had to pay for the phone calls, pay £15 p/m for the broadband, were sent the Wireless G router, and all of this for only £8 p/m more than the original price we were quoted! so helpful!

We even told them when we put the order in we couldn't get LLU in our area.
Very long setup time - it took 2 weeks from our initial order for the phone line to be installed, and they quoted a further 21 days after that for the broadband to go live. 21 days after our phone line was installed I called them because our line still wasn't active, and they couldn't tell me when it would go live. I think it took 14 days or so on top of the 21 days we were quoted.
We asked to be Ex-Directory, our welcome booklet said we were directory listed.
Up until late last month we were still being charged for phone calls. They said we wouldn't be anymore, I don't think I believe them but we'll see on next months bill.
Basically they messed a lot of stuff up, we must have had £100 or so worth of credits from them due to the problems we've had and the empty promises to resolve them. I asked the agent I spoke to today to replay the notes from our last call and what they did/said was absolutely not what they told me they were doing.
The guy today started going on about how Talk Talk are the biggest/best value for money etc, so I told him they might be but they're also the most hassle, that shut him up pretty quickly.
Thankfully we are now eligible for the LLU service which means we can be put onto the right package, they've scheduled in the upgrade for the 13th of September.
I'd have switched providers ages ago but there is bugger all here really, no Cable/VM and no other operator is provisioning LLU here yet.