I use the RADs' all the time. I have been able to develop some new(for me) strategy's for trimming trees. I now often will shoot a line way out high on the end of a branch to reach a hard to access point, going straight up the rope 50,60,100 ft through space, eliminating a long hard climb.
I also made my system more user friendly by getting rid of that foot strap. That foot-strap I feel is a big pain. I instead do a combo pull and footlock. Even if you don't know how to footlock, you can probably foot lock on the rads. You hardly use any energy. It makes a huge difference in usability of this SRT system. That footloop gets lost, stuck in the trees when you throw it down, you never seen to have it when you need it, and hooking and unhooking it removes some of the spontaneousness of the SRT experience
Of course if your on gaffs you have to use the strap.
You also have to master the throw ball and bigshot for any SRT style to be effective..