If the slight extra weight doesn't bother you, then the GF frame is fine....probably more durable as well. I started my days in multis with Xaircraft till the frustration got to me, but I must say, they make good frames. Quite rigid, not nearly as much flex as the F550 frame.
For me personally, I haven't found a better hexa frame for the price and features. The tube rails make it easy to balance camera mount and battery. I just received a second frame today along with their CM-130C-TP
http://www.cnchelicopter.com/servlet/the-2013/Xaircraft-x650-CM130C-dsh-TPS-two/Detail and
http://www.cnchelicopter.com/servlet/the-2229/Xaircraft-CM_EXT-biaxial-PTZ/Detail for larger cameras. Hope to get it built by tonight if the wife eases up on the "to do" list she keeps hitting me up with
Bottom line....I really like this frame.