Recently did similar for the most part it has been fine, there are quite a few drawbacks to Virgin compared to Sky which I accept due to value newbie pricing but for Sky sports specifically
No UHD on Sky Sport
The TV on the go app is not as well integrated as Sky, so you will need separate app for sport and bbc. etc, it doesn't work through Virgins TV GO app.
Series link works fine, though any UHD sky series stuff is not recorded like you can do on Sky, it is streamed from Sky and so you have to specifically select UHD episodes to watch it.