Contrary to what everyone else is saying in positive...
-Virgin Media are notorious for changing terms and conditions on customers. Most recent being a traffic shaping package being brought in across all tiers. Incidentally, said shaping now means that on the top tier you hit your quota and are throttled back after about 30 minutes full download speed
-Of late I've noticed packet loss and high ping times, not to mention horribly slow DNS lookups. Funny, when throttling has been brought in to provide network consistency to all customers.
-Telephone support is 25p per minute to India, something else that was phased in fairly recently.
-Have had multiple run ins with their billing department for overcharges, resulting in MANY lengthy (2hr+) phone calls getting bounced around every department up and down the country being hung up on, insulted, lied to and fobbed off. Had this happen on 2 separate issues - both VM's fault, both resulting in compensation after angry letters sent.
Took months to resolve, and by far is the most appalling customer "service" I've had to endure.
On the flip side, I know there are a lot of happy and content customers out there, but having been an ex-NTL customer since broadband began on cable I've watched the service get better under NTL then drop heavily under the VM buy out.
At the end of it depends on what you're using your connection for, but personally I wouldn't bother getting involved with VM. I'm regretting it, and can't wait to be shot of them when Be ADSL comes to my exchange.