The first week I used the three sets I purchased, I thought these were amazing...then the older litter started causing problems.
As the box gets slightly dirty, the "pee balls" start sticking to the sides and it becomes a three hand process. First sift, shake and scoop/push the pee balls down so you can dump them, but the box can’t be held with one hand, so you have to set it down to scoop, and the litter goes all over your floor.
Also, lumpy, wet litter gets in the sifting cracks, and now those go against your floor. The boxes started being more work because you have to clean the layer every time you dump them.
My situation...two older 18-year-old cats who are peeing large amounts and two two-year-olds who have normal pee amounts.
This box is for a one young cat user.
Bottom Line: No, I would not recommend this to a friend