Funny this popped up, I was just looking for a forum on this!
I've just bought the Covert VR_s driver after testing 6-7 clubs and can tell you it's absolutely transformed my driving! I took it out for the first time last night and literally (apart from 1), missiled it down the fairway.
It's been a weak point of my game for a while and I'm really pleased that I can replicate the form on the course that I had in the testing session. Especially happy as I've got my first club competition on sunday.
Ultimately it depends on what driver you using at the moment as to the difference you'll see. I was using an old Yonex V-Mass with a 9 Degree loft, which was passed on to me and picked up the 10.5 degree VR_s (non-tour). I would highly recommend it and it also installs confidence with it's fantastic looks at address.