Seb I learned to fly on the sig senior. I would have to say it is the most well mannered plane going. I had an OS.46 on it and the plane had no bad habits and was unbelievably steady in the air and a pure joy to fly. I think with a little more power it would be more maneuverable in the air but it is a great trainer and would make a great aerial photography platform. with a very large wing and very low wing loading, with enough engine it will have no problem carrying a little extra weight around and still be an all around stable flyer
and a breeze to land.