i have no doubt the gt pro's are great arrows initially, but i just wonder what happens to their spine over say, 1, 2 even 3 years of shooting. does anyone have experience shooting these shafts for an extended period of time?

i am in the market for some new sticks for next season and really have my heart set on a/c/c's. but for some reason i keep going back and looking at the gt pro's. (maybe the price difference keeps me intrigued? if i can get a great arrow for cheaper, why shouldn't i, right? ) seriously, i can't help but wonder how the spine on these shafts will hold up after a year or two of shooting...