I get the 10Mb service here in Edinburgh from Virgin at home, and the 8Mb service from BT at work. They both have their upsides and downsides.
BT are filtering out my DCC traffic at work which is a real PITA (and no it's not a company policy, cos I actually set that), so although BT have dropped Phorm for now, they are still doing other forms of deep packet inspection. At least I never get near their Fair Use threshold
Virgin do a fair bit of rate-capping, but generally speaking after about 10 or 11 pm, things go nice and fast. So I get 1.2MB/s downloads which is very nice. Although the up speed is quite low at ~ 40KB/s. So although Virgin isn't ADSL it is still very much asymmetric.
I could get the 20Mb service right now, but it is far too expensive, unless I take a whole raft of unwanted TV crap. Like many others here, I would have absolutely no idea what to do with a 200Mb service. Even if I were to set loads of unattended downloads, I simply don't have the hard disk space to store them ....
All in all, I find cable is more reliable than ADSL (but Virgin customer relations can be a nightmare when things go astray) and there aren't the same fluctuations due to local loop lengths, line interference etc. Despite claims about ADSL2++ and other esoterica of the twisted pair line, the only real chance of fast broadband is by optical cables. And that generally means Virgin for home users.