The floats work fine, though if you hold full nose up elevator at the beginning of the takeoff run, the plane will nose up significantly, and rest on the heels of the floats, which are really high compared to the steps. Even that's no big deal, just push the nose over a bit, and they'll get going.
The spoilers which were used as water rudders run on a hydraulic system. That system has a bypass, to prevent damage to the spoilers if you hit anything (like the bottom, a log, etc) with one of them. That will collapse that spoiler against the float bottom, and now you will only be able to turn one direction until you get ashore and rummage around inside the offending float, to reset the hydraulics.
It's easier to bump one of those spoilers than you might think, which is why I strongly recommend changing to standard type water rudders. Again, that should be easy enough to field approve, but you'll need to gather up some parts.
MTV