VM cable performance depends a lot on where you live.
If you live near me you might find yourself getting this sort of thing on a 50Mbps connection - enough for me to give up on VM and downgrade to 10Mbps while deciding whether to go back to ADSL or wait for VDSL to be available to me.
So far 10Mbps has performed pretty much what you'd hope but jitter is still poor as it's still on the oversubscribed DOCSIS 3 channels my 50Mbps was on.
This is my current 10Mbps TBB chart....
