The GT33 is my first gasser. It's a powerhouse for sure, on the maiden flight of my 80.5" Giant Big Stik it went vertical ... got so high we couldn't hear it, then so high we couldn't SEE it anymore, and it was not at full throttle.
Unfortunately, the ignition module failed just before landing and the plane was landed with a successful dead stick landing. We never got it to start again. Testing it with two different charged batteries and a plug out of the engine but plugged into the cap and the shell grounded gave not a hint of spark.
So now after one flight, the ignition module is on its way back to Hobby Services. I spent a lot of money for OS quality... not sure I got it.