We have used the GKF TKO and performed great, its easy to setup, quick to tune and is a simple to use rest making it a breeze to setup and use.... not to many parts to complicate its use .
I personally used the GKF Infiniti Dropaway for ASA 3D Competition last year and was so impressed with it that I decided to use it for bowhunting this year and it has performed FLAWLESSLY....... I originally wasnt sure of how it would hold up to the abuse my equiptment takes in the field while bowhunting, but it has held up perfectly... it features screws that self lock so you dont have to tighten down your ajustment screws
I used it to take a Possum, Turkey, Doe and 8 point Buck this season.
I personally cant speak to any other dropaway rests as I have never shot any other dropaway rests only GKF