Your timing in posting your observation is perfect.

I just got back from playing with G3 at the local hobby store. I found the PT-40 to have horrible flight characteristics. The glide ratio was terrible and it was waaaaay too unstable when flying inverted. Chop the throttle and the nose dipped "below the horizon" and there was no way I could keep it up for a main gear landing.

I just got home and tried the PT-40 on G2 and confirmed that it flew, well, like you would imagine a trainer to fly - not on rails but still stable and gentle.

I was not impressed with my short demo of G3.