dont overfill .... To add my fTO had one of the first UK imported Grob115 on loan from the dealer for a few weeks, so to be honest I only did probably twenty instructional hours on it. I don't recall any issues with it. The G115 Tutor is the usual RAF upgrade, so like the difference between the Beagle Pup 100 (which was underpowered) and BAe Bulldog.
My main concern was flying a composite aircraft and having a lightening strike without parachutes. In the accident you mentioned were there CB's around? Can you let me know the regn, I would like to read the report.