I have both the RC6GS and the Fly Sky GT5. The RC6GS packs a lot more function and has a very far range, but it is a bit bulky (and heavy) and drains batteries very fast. The FS GT5 on the other hand doesn't have as far range (still has plenty), but the design is ergonomic, the LCD screen is much easier to maneuver, has audible alarms (when you leave it on without using it too long; low battery), and overall has better build quality.