I have had an interesting back and forth with technical support in the newsgroups that ended up in virginmedia.feedback after originally being in virginmedia.support.broadband.cable. I have the connection shared in my flat because we all need it for our course and access to course materials. I chose 10Mbit because 2Mbit was a bit slow for 5 people, and ordinarily, it shouldn't feel that slow.
Imagine my surprise when I asked how many times we've been STM'd in the past month and a half. 14 times last month (January 2009) and so far this month, 5 times! That works out around 1 in 2 days STM'd. I now know why the connection slows to a crawl most evenings.
The kicker is, when I compared the STM limits across the 3 tiers (2Mbit, 10Mbit and 20Mbit), 10Mbit was worst off. During peak times 10Mbit gets a lower-than-half limit than 20Mbit, and barely twice as much as 2Mbit.
I'd ask what the hell Virgin think they're playing at, if I thought it'd get a response. Sadly, I doubt it will.