I think the V7 and V8 pickups are very good pickups, they sound nice and warm clean, can be bright and twangy split and crunch nicely.
They don't really have a very "defined" sound to my ears though, kind of stale sounding and sometimes can get muddy with some amps.
I prefer Dimarzios personally, it's all a matter of taste though. I had V8 and V7 pups stock in my RG520QSTB (mahogonany body) and I thought they sounded "okay", but I swapped them for a set of Evos and
For the heck of it, I put the V8 and V7 in my 1990 RG 550CM and they sound pretty good in there. The original pups in that were the V1 S1 and V2, AWFUL humbuckers in my opinion, the single is nice, but I don't use it much anyway.
I sold my PAF Pro and Super Distortion that were in there since I'm planning on dropping a set of Evos in there as well. I just fell in love with the tone and output on those things.
The neck Evo is very much like a PAF Pro in sound, to my ears, just louder, and the bridge Evo has a nice tight bottom end, no mud and pushes any amp into overdrive with very little gain, but cleans up VERY nicely at lower volumes.
Can you tell I REALLY like the Evos? ;-)
I can't really compare the Ibanez Vxs to any other brand, they can sound nice and smooth, crunchy and nice clean as well, but I've had trouble with mud in some instance.
I wouldn't call them bad, not by a long shot, I'm using them in my 550 at the moment and I'm happy with the sound, but since I have had different pups in there already I KNOW that there are much better pups out there, it's all in your ears.
The Powersounds, on the other hand . . .
. A friend HAD a set in his RG 370 and couldn't wait to get them out . . . close in sound to a cat having his/her tail stepped on, in my opinion.