Broadband fine, TV rubbish
I've had broadband through NTL/Virgin/whoever for a year or two now, and I've barely had a problem with the service itself (the year it took them to sort out a refund for them opening two accounts and charging for both is a different story altogether). The up and download speed have been fine, and I do a pretty hefty amount of downloading torrents and the suchlike.
The TV, on the other hand, is pretty appalling. The guide is incredibly slow, and there seem to be several buttons I can press which seize the whole thing up for a minute or so at a time. The 'On Demand' service simply doesn't work, and every time I phone the call centre in India I have to go through the rigmarole of them sending something to the box, which apparently takes two hours. Of course each time I phone the person I speak to has no record of previous calls. The new much-vaunted Central service doesn't work either - scant recompense for the lost Sky channels. Nor (often) do the pay per view movies. I am generally met with indifference by any customer servants I eventually get through to. The service offered by Sky (including interactive) is considerably better - I would have it if my landlady would let me put a satellite on the roof.
And mine costs me about £70 a month for the pair. I was paying a price similar to another poster, but that went up very quickly after the offer period ended. When I pay this much for something, I really do expect it to be pretty perfect, and frankly it isn't.