As far as the design specs go, the water collection crevices do not go nearly deep enough to keep the water separated from the soap, which is kind of the entire purpose of the tray. Not only that, but the crevices are the exact same size as the soap, meaning that when the soap is on the tray, it’ll trap the moisture in, leaving the soap mushy. The edges of the crevices are also so sharp that any time you pick up the soap you end up scraping off a lot of it.
Also, I’m totally in favor of a product that is designed to biodegrade… so long as I get to use it first. The tray arrived having already accumulated shavings in the packaging, and began to come off onto the soap starting on day 1.
For reference, I store the tray with my soaps on the dry side of the shower curtain on the side of the tub.