Am expecting getting the rx/tx setup to agree with each other and properly failsafe to be a pain. I believe there is a workaround (Mr Weston to the rescue!) though.

The HK motor is of unknown quality. Joking aside, it feels pretty nice in the hand. I think they have improved a lot over the last 12-18 months. Many a 12lb/30lb robot has used HK or HK-based weapons with success. Reviews for its intended use are generally all positive. Only time will tell if it appreciates swinging Rango's drum around!