Has anyone flown each of these? I have a nearly completed GP Super Skybolt (Kit, NOT the ARF) and am considering both.

Please keep comments to these two engines. I have ruled out OS, and four strokes for the sake of this question.

Factors I used in my decision:
Cost
Reliabilty
Power (they both should be more than adequate)
Ease of use/tuning
Prop range (the skybolt does sit a bit low on stock gear)
Weight (actually not just the lightest needed as the skybolt does come in a bit tail heavy)
Ease of finding a pitts or in cowl muffler

Thanks to all with experience who can share!

Eric