Hi Jonathan, I have a Super Seal 26 which I keep on a full water mooring on my local river. As others have mentioned, it spins from side to side quite a bit and i have tried to combat this by leaving a couple of feet of keel down, but it hasn't helped so i just accept it. I did wake up one morning on the mooring very close to the neighboring boat as both boats had swung around and were facing aft to aft, but it was still six feet away so was never going to collide. It's a great boat by the way, I've only had my for one year but absolutely love it. Cheers, Nick.