I have used the higher level WGT balls, think they are about 112 per sleeve and find them to work better for me than the Nikes, meter is faster but they are more consistent in the wind. I tried the Srixon and found them to be similar to the high level WGT balls and about the same price when you factor in durability.
Since the invent of the new slow meter balls, I have seen a pretty big difference in the CTTH ready gos that I play. I was consistently finished 3 to 5 places higher and now I have been moved down in those (I assume my play is the same). Scores that were making top 5 are now around 10th.
This is a game and we need to keep it that way, Paying as much for golf balls as they cost in the real world is a little insane - okay it's not as much but it's getting close.