Product review (2 stars): No rigidity after rinse.
For the first few weeks, I would have given this 4 or 5 stars. But then I rinsed it out in cold water.  After that, it has no rigidity.  The only way to get the top piece of the AC over it is to fold the filter sides in toward the middle.  I'm hoping that will still put out some humidity but it's clearly not the way the filter is designed to work.