I have some Pro V1s in one pocket of my bag and some cheaper balls in another pocket. All of them are in respectable condition. Anything that's not gets thrown into my practice ball bucket.
If I'm just messing around I usually grab a cheap ball and if I really care about the round I grab a Pro V1. Not that it matters much (if at all). I haven't seen any real evidence that the ball I use relates to the score I'm going to shoot.
Seems like I get an extra yard or two with a Pro V1 in the summer and seems like I get an extra yard or two out of a SoLo in the winter, but no hard evidence that's accurate either.
That's not to say that I don't notice a difference in different brands, models, and age of golf balls because I do. Some go farther, some spin more, and some have a better feel off of my putter (or any club for that matter) but my scores show those things are not the determining factor in what score I'm going to shoot on any given day.
Outside of a few brands that feel like I just busted my driver face with a rock, that I won't EVER play, I'll play casual rounds with almost anything else.
Lots of times I'll be playing along with what I consider a crap ball and realize I have a Hell of a round going. Other times I go to the trouble of picking out a better ball and have a round FROM Hell.
When I had my best ever round I was playing with a "Cougar" that I had found in the bushes the day before.
Edited by MS256 - 7/2/13 at 7:25pm