The Concept is a flapping head type if memory serves me you can get boom strikes easier than the solid head designs. I had quite a few rough landings when autoing and had quite a few boom strikes I felt was largely due to the flapping head design..
The Revolution PZ 200 is a non-HH gyro (Piezeo) that hold well, but not a heading hold gyro. I flew with a few of these when the CSM gyro's were first out and had good luck with them..ok if you are strapped for cash, but eventually you would possibly want a better Futaba GY 240 or 401..
Venture or Caliber would be a good choice...My 2c only..