I'll give you my own experience...
The first time I used V-Power was with my previous car (also Turbocharged, albeit less powerful than the Scooby). I was running very low on fuel and filled up with V-Power purely by accident - I wasn't even aware I'd used the V-Power pump. However, about five minutes after driving away from the pumps I noticed my car was definitely feeling perkier and smoother. It was only when I got home and checked the till receipt from the garage that I realised where the performance boost had come from! I've used V-Power almost exclusively since then.
If there are economic benefits to using this fuel, my feeling is that they aren't quite enough to offset the extra cost. It will, however, make some engines run more smoothly and, well... more quickly. It's up to you to decide whether it's worth paying the premium for (no pun intended).
As an aside, I noticed only the slightest difference running my last non-turbocharged car on Optimax vs regular 95.