I have a Seamaster, bought of E-bay ( shipping to high ). Flys great and is very stable, be very careful about spins. Secound one caused the plane to hit the water hard enough to rip of the wing and pull loose the bulkhead that the pylon attaches to. I have repaired it and it still flys fine with a megatech 46.
a friend of mine has a Mariner which also fly fine. he bid manage to break the dihederal joiner in a landing that did not look that hard. repaired it on site and was flying in munites.