As long as they both fit and work smoothly and have the same linkage holes, you probably wouldn't notice a difference between the G-Force and TT arms.

The Sonix parts that Helidirect sells have good prices, but the ones I've gotten have taken some attention to make work smoothly. The tail I got was a steal at $55, but even so, when you say "CNC" I expect the parts to fit right away. On the other hand, they're a good hard alloy, so I don't expect to ever replace those parts.

A very little dab of CA on the screws may keep them where you want them. I wouldn't replace the bearing blocks for that.