Tradarcher:
I finally gave up on GTs earlier this year, and went with CX Maxima shafts. I probably purchased the GTs over the period of a couple of years prior. On every one of my bows (three r/d longbows, 40@30# and 42#@30, one 'curve at 37#@30, and an Ibex at 40#@30), the wear pattern on the shelf was identical -- tuning for good flight resulted is significant wear on the outside of my shelf. And those bows represent a range of center-cut as well. Tune to fix the wear, and flight went heck. I tried everything -- adjust spine with inserts and points, without inserts and longer heavier points, FOC, shaft mass, nock point, etc. without being able to solve the riddle. The CX, on the other hand, are perfect from all those bows. Minimal shelf wear where it is expected on a bow. Go figure.
I will give GT due chops, however, for being durable. A GT Hunter shaft with a brass insert is about as indestructible a shaft as there is. I blew the nocks and backs out of GTs from time to time, but never had one actually fail from a bad hit in the field. In contrast, as much as I love the CX shafts, I have snapped three this season, not counting a couple of robin-hoods.