Wow - just read the entire thread - lots of strong opinions out there.
My 2 cents:
The place I normally play has bent grass greens, and to keep them alive in the Memphis summer, they keep them wet, so extra spin generated by the Pro V1 is a little bit of a waste. Even a cheap ball makes a monster divot and does not go far. Really cheap balls are lousy to chip and putt with, but the mid-range balls like the DT-solo, NXT and Nike super soft are great. If I was buying balls though, I would buy the new TopFlite D2, they seem like a good compromise. (I don't buy balls - I play what I find - we have a lot of nasty ditches on our course - I am playing Bridgestones now and they play fine)
The only place I have found that a Prov1 helps is on a course with bermuda greens, they are generally rock hard and every little bit helps.
I am not a particulary good golfer, have no official handicap, but generally shoot in the mid/high 80s. Even if the Prov1 would shave strokes off my game, I would not buy them, it just hurts my feelings to pay that much for a ball (cuts down on money I can spend on beer, heh, heh, heh)
The only Prov1 balls I play are the one I find, and only when the greens require it.
A man has to know his limitations..................