I have loads of floats that failed/sunk. In fact almost every aircraft I have inspected, five 912 to be exact in trikes and airplanes, and ALL have had failed floats. This is a big problem.
Just orderd the new ones, version 4, which just came in are supposed to be the latest and greatest. Hopefully these new ones will work.
Here is some more details on this if you like.
http://www.trikepilot.com/members/profile/273/blog-view/blog_1157.html
Here is part of my collection of bad floats:
http://www.trikepilot.com/members/profile/273/pictures/25471/2