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It works great, there won't be any issue with dog kicking out a litter pellet from the box since they won't be stepping on those. it reduces the cleaning the area around the box much more convenient. what is even more convenient is that the urine will be drained to a gutter to clean, making that slightly more convenient. Iust put a cat litter clay in it, scoop that area away and done.
In exchange of that convenience, now you will have a grass pad retaining urine that won't dry as fast, making the box smell despite cleaning and give your dogs a wet urine feet to walk around your house. Not even hot water will get rid of the urine. To me, this is a quite a disappointment for such a high price on this.
The "grass" truly allows the urine to drain into the draining base and collection tray. No smell and with two schmoodles the grass and tray need a rinse every few days. A spare grass pad comes in handy for those times.
Excellent size! Good artificial grass topping easy to keep clean. Dog has more room no longer stands too close to the edge of tray ... no longer misses the grass with his business ending up on the ground.