Hi Oz'
Not sure what Tecnam you are moving too, the Tecnam we are talking about is a Golf 1oo .
The difference I notice straight away is the view, it feels more open, so when it feels more open you feel more comfortable and relax, the more relaxed obviously you will fly better.
It's lighter on the controls, landing is a bit slower, no flap landing are a breeze. Stalls are quite different. The Jab is so benign, where as the Tec' will drop a left wing every time. That scared the crap out of me the first time we did stalls in the Tec' after doing them in the Jab'. the only other thing is there is no carb' heat on the Tec', one thing less to think about on landing. I love the Tecnam and I think you will as well.
Cheers
Rick