Overall Pocket Lint gives the V6 a positive review and concludes:
There is absolutely no doubt in our minds that if you are an existing Virgin Media TV customer you should upgrade to the V6 box...Read the full review here: Virgin TV V6 and here’s their review of the Sky Q system, too
The fact that the box works so well with an existing TiVo device to provide a multiroom solution should be considered too. It’s a great upgrade option for existing TV subscribers.
[Original post edited after Sky updated Sky Q firmware]