Bests & Worsts Reviews from Amazon

I have similar mats by Blackhole and iPrimio. I've had the Blackhole mats for about a year, and the iPrimio mat for about a month. I have two 1 year old large cats and three litter stations. I use Sterilite 28-Qt boxes for litterboxes and Dr. Elsey's Precious Cat Kitten Attract Training Cat Litter (this litter has much SMALLER particles than other normal (adult) litter). These mats come in smaller sizes, though I only have the largest sizes available. Here's a comparison of the 2 mats. Blackhole: --XL Size is 32" x 23" (largest size available) --3 sided stitching keeps litter inside mat nicely --Smaller holes than iPrimio but still adequate --Top of mat has three levels to help catch litter: protruding round nubs, lower levels nub connectors and the holes --Inner bottom of mat also has crevices to catch litter --Latest attempt to purchase (July, 2016 from two different suppliers, AMZ and independent) failed. Three orders = three returns. All mats had a sharp ammonia smell. iPrimio --"Jumbo" Size is 32" x 30" (largest size available) --1 sided stitching seems to be OK, too, but perhaps not as well as 3 sided sealed mat --Larger holes may be more helpful with larger litter particles than our Kitten Attract --Mat surface is a single layer of flat material with holes --Inner bottom of mat is smooth and does not help catch litter Which to choose? *I like the bigger size of iPrimio. *The larger holes of iPrimio don't seem to help or hurt (in catching litter or with 2 young cats walking on it) But *The iPrimio's single vs 3 sides sealed might affect the mat's ability to hold litter *The iPrimo's single sealed side does mean you have to be a little more careful when picking it up to pour litter back in boxes. *The Blackhole's bottom inner surface with crevices plus being sealed on 3 sides help contain litter better So, overall, iPrimio is a good choice. Both iPrimio and Blackhole are superior in design to just a rug or those PVC stringy mesh litter rugs that never seem to release the litter or allow for a good clean up of vomit. Both allow easy clean up of litter and to put it back in the box. If size were not an issue (and if the latest batch of mats weren't contaminated!), I'd likely choose the Blackhole mat over iPrimio for it's slightly better ability to contain litter.