Hi Guys
I have had a Rush with an OS91FSII in it. I sold the complete package, but still get to fly it:-)
With a Bolly 13.5x6 prop, I would put it into a hover on takeoff, hold it for a while and blast off. With this set up I could get the plane to fly the PO5 pattern. Actually, I bought it to practice PO5 and only did once.
The Rush is an excellent 3D, hotdogging and pattern model. Hats off to the designer.
I sold the Rush to get the Cyclone you guy are talking about. I have a YS140FZ in it swinging an APC 18x6w. It is an awesome combo.
A guy at the field has the Adrenalin with a OS91FX in it. Does all the 3D stuff with ease and flies F3A very well. I liked to fly it slow and low doing point rolls, rolls and rollers. Kinda bummed I had to give the sticks back.
I would have to say the Adrenalin is the pick for me. I can't wait until mine shows up. It will be getting the YS140FZ in it.

Cheers

Buzz