PMFJI. After more than 500 flights and still counting, I can say few things about the ROO. First off, I've flown the Roo with 1000, 750 and 500 class engines and below are my observations.

With a 1000 class engine:
1. Only take off with half throttle. If you apply more power, the nose will stick to the ground and will not rotate fast. You can go full throttle after takeoff and go vertical if you deem it necessary.
2. Never gun the engine on take off. Slowly apply power.
3. Hold full up elevator before you start your take off roll
4. Never attempt turns with more than half throttle. If you do the airplane will tend to slide and will not turn
5. Never pull up from full throttle level flight. If you do, you might regret it.

750 class turbine:
1. #1 above does not apply
2. Same as #2 above
3. Same as #3 above
4. Not as noticeable as #4 above
5. Not a problem as #5 above

500 class engines
1. #3 applies
2. You can ignore #'s 1, 2, 4, & 5

Modification:
1. I extended each wing half by 4 inches to make it more than IMAA legal
2. Left the CG on a little tail-heavy side. I can land and let the ROO run down the runway with the nose up for more than 50-100 ft. (NOT RECOMMENDED FOR THE FIRST 30 FLIGHTS. Gradually move the CG until you are comfortable with the handling)


IMOHO, Hotspot and ROO are good entry level turbine kits.