A friend of mine owns a 60" Rufe which he and I have flown several times. It flies well but the water handling can be a little tricky. Depending on winds, one or the other of the tip floats will want to drag while taxi ing before take off. The plane will want to turn in that direction and you need a powerfull water rudder to counter the float induced turning. Once you start to accelerate for take off, it becomes much more directionally stable. Another sort of odd thing that he and I both experienced was that it was easy to become dis oriented as to the flight attitude of the plane. It was hard to tell if the plane was turning toward or away from you. All of the floats hanging off the bottom seemed to "confuse" the sight picture.
I had a scale OS2U Kingfisher that was the same way. Maybe it was the color scheme and maybe it was just us but we both experienced the same difficulty.