I have been shooting GT's for quite a few years. Tried some of the others and again, right back to the GT's. I personally never had a GT's spine degrade. Of course if you shoot the same arrow for 2 or 3 years, this may be different. But who here can keep a dozen shootable for that long? I go through close a dozen a year busting nocks and splitting the ends and such.

I don't shoot the Pro's as I shoot a 27" arrow and can get the XT's just as straight if you take care to cut equal lengths off both ends most of the time.