From the pax perspective ... Rode them for a number of years on the Luton Isle of Man with Manx Airways.
They were fine in fine weather but tended to be a bit skittish in wind. It did not feel like a substantial machine. Unlike the J41 that feels right for it's size, the ATP felt like it was stretched. Kinda glad that I had not read El Desperado's comments when I was a regular on it ...