I've been playing the Pro-V1's exclusively this season as I have taken a much more serious approach to becoming a scratch golfer. There is not a doubt in my mind that this ball out performs any other ball that I have used, most notably in the spin category. I may have seen a little increased distance with my driver, but I noticed a significant increase in how well I can control the spin of the ball on approach shots. Depending on the shot, I can make a 7 iron release 3 feet forward or spin 3 feet backwards, which really inspires a lot of confidence in my shorter irons.
Yes, they are expensive but that's just part of it. To help ease the cost, I usually buy a box of new Pro-V1's in the spring that will be used for tournament play only throughout the year. Then for practice, I go on eBay and buy Pro-V's that have been recovered and cleaned. I bought a bag of 25 balls for like $27 dollars, and about 15 looked 100% brand new. The other 10 may have some logos or markings on them, and maybe 3 would have very small scuffs caused from the grooves of a club (no cart path scuffs). I have yet to notice any difference whatsoever in performance between the box of new balls and the recovered ones that I've bought from eBay. The only differences are purely cosmetic with country club logos or sharpie markings.