It smells bad like plastic, you can't see if you cleaned it well because it's opaque, it's hard to step on, slightly annoying to connect the two pieces.
The worst part is that it gives a feeling of unhealthiness, I don't know how true it is, but I threw it away a few uses after feeling insecure.
The previous one I had, Betadine, which I couldn't find again, was much better.