Out of the fair few people I know with a superhub I'd say it's a 70/30 split as to who has problems with it.
When I was still with VM problems with BB were rare but I had a really bad time with the TV service.
I had loads of problems with the VM adsl and have had very few with the BT home hub since I've had that (touch wood

)
I guess the thing is that you can / may get problems with ALL providors.
Most people can only go on their own personal experience.
Me, I wish I could still get cable BB but wouldn't touch the TV service again.