I've not had this mat long enough for the true test of time, but so far, so good!  We struggle with cat litter being tracked throughout the house on the hardwood floors by three long-haired cats.  This year, we decided to take action.  So, we purchased two Tidy Cat pellet-style litter boxes, a Roomba vacuum, and this mat for the litter boxes that still contain clumping litter (which is the culprit in our war against cat litter).  Since purchasing this mat, I've noticed a marked difference in the amount of cat litter on the floor around the cat box, as well as in the rest of the house. 

Pros: Seems to do the job as advertised.
Cons: Even bigger would be better!