We are very happy with our Stainless Steel Litter Box. Quality is great, but the main trays can be hard to separate when the tray with the litter inside, is inserted into the changover tray. The weight the litter and cat going in and out causes it to "bed in" and not drop out when the whole unit is lifted up off the ground to change trays. We have had to use a screwdriver to loosen the seal, as the gap is too small for fingers to prise apart, especially when your fingers are holding the unit off the ground. It only needs a bit of a wiggle, but it was taking two people. We solved the issue by inserting a thin mat between the two solid trays. Not a criticism at all, just some feedback. :-)