Hi
Did a couple hundred hours in one and learnt a few lessons.
1) Needed some ballast in the back for training and only 2 up front
2) Manual gear extension requires 3 arms, 6 legs and 3 chapters of a Karma Sutra book to operate
3) If the bladders dry and unstick they can "float up" and give false indications of fuel
4) In the flare the turbulent flow from the wings tended to reduce elevator authority and made for some very hard landings, not helped by big fat low compression undercarriage
5) Barely climbs on 2 engines in warm weather let alone one
6) I think I remember the fuel caps to be finicky as well
May all be horse s@@t and only I had these happen issues but otherwise survived