Review (1/5): Sponges disintegrated rapidly.
This item is hard to use and the sponges seem very fragile. The Redecker Inter-digital Toe Brush, although expensive, is a far superior product for my purposes.
6/13/19:I have upgraded my assessment to 3 stars; the device is easier to use with a little practice. I still much prefer the Redecker.
10/5/19: I haven't used this product for months - the sponges rapidly collapsed.