Both GT and Carbon Tech make great arrows. If you are purchasing the pro grade GT's, you will see the same weight variances as any other arrows. Out of the 3 dozen Pro 22's I purchased last season, I found 1 full length shaft that was more than 1 grain difference from the rest of the dozen. So their weight tolerances are pretty good. Spine tolerances may be a different story though. I have not personally tested either on a spine testing maching, but have read favorable reviews showing great results with the Carbon Tech.

I will be using both this year. I will be shooting Pro 22's for ASA events out of my Constitution, or if I decide to shoot my Allegiance in short stake/pins class in local competition where there is no speed restrictions. For my Constitution with a lense, I will be shooting Cheetah 3D's because they are a bit lighter and *should* help get me to about 300fps out of my Constitution with a good spine, and FOC according to OnTarget2. I don't know what I will hunt with this year, but they will be either Carbon Tech or GT's, thats for sure.