RE: Prerotator devices
Hi Joel,
I have two of the PTGyros and one PT25 and I think they are great. However, I also converted a Sig Senior Kadet and a 1/3 scale Cub to a single rotor gyros with the flapping blades and both were much more stable than any of the PT Gyros probably because they are bigger. I also have the RotorShape gyro and if you just want to flip around the sky it will do it better than any of the PT's, probably because it's smaller and better power to weight ratio.
So it all depends on what kind of flying you enjoy and for a beginner, getting the gyro in the air long enough to experience the controls is probably the most challenging and the pre-rotor certainly improves the odds.
Phil