I don't know crap about a GMS engine so I won't say anything about it one way or another. I have known some folks with them and those airplanes were always problematic. Mostly smaller ones if I recall correctly. Anyway, I do like the Supertigers for the price. I am an OS guy myself so I would suggest one of those. You here people bashing an OS because it is actually EASY to get up and running. Some people will say you arent very smart for using an EASY to operate engine cause you should be challenging your skills more. I call bull**** on all of that crap. I love an easy to use easy to tune engine. Maybe it costs a bit more up front but you'll spend more time flying and less time cussing. So, maybe you don't cuss, fine then you'll spend less time repairing damage from an untimely engine failure. I have always really enjoyed it when my old K&B would run great on the ground and for some reason would sputter on takeoff. That always causes constipation if you know what I mean. Anyway I wish you luck on whatever you decide. Do us all a favor and roll some video of the maiden after you get it up and running.

Wes