The Jab is a pig in turbulence. The rudder characteristics described above are not unheard of in the RAAus world, but given many students find rudder co-ordination an issue in Spam cans, the Jab isn't going to help that
For middle-aged, can't-pass-a-medical or "dreamer" types
a Jab might be fine but for other students going on to bigger (dearer) things a Gazelle is a better trainer, or a Skyfox (taildragger) better still.
What do we think of Tecnams?
Cheers