My experience of them is pretty bad. Although when the connection works it works at blazing speed it's rarely working as it should. It took over 10 engineer callouts, hours on hold and 10 months before someone thought to put something on my line to correct the clearly wrong power levels. That was 10 months of packet loss and random disconnects lasting up to several days.
My connection worked for a few months before suddenly I started getting insane ping and packet loss making the connection unusable at peak times and only usable for regular browsing offpeak. After 5 calls to Virgin media support they finally admitted that they had some broken equipment which was affecting the local area. They gave me a date by which it would be fixed which they pushed back twice. I'm currently hoping it will finally get fixed on the 11th but I'm not really expecting much.
That's my current pingtest and that is fairly representative of my peak service over the last few months. Offpeak ping drops to about 100-200 and packet loss is 2-5%
Basically what I'm trying to get across is that you would probably be much happier with one of the more reliable DSL providers than Virgin or with BT fibre if you can get it. It's really not worth dealing with the [censored] that VM flings at you for the extra speed.
Edited by tired_out (Wed 09-Mar-11 00:05:48)