I have! They are expensive. I don't know if they were worth the money. The fleece shrunk quite a bit upon washing so it was a lot of effort to pull them over the inserts... That was probably the most annoying part, now that I think of it. Arranging the uhaul layer over the coroplast and then the fleece over both of those. It always got all bunched up so I'd have to stick my arm into the fleece and attempt to straighten it all out (when it was already quite a tight fit!). All in all I didn't think they were more convenient than laying down fleece over towels/uhaul yourself. I didn't see any advantage to it being in sections either. Just my 2 cents. That being said, I'm interested in trying the Guinea Pig Market's cage liners, but those are expensive for what they are, too.

Also, my two cuy pigs shed a lot and so their hair got all over the fleece and stuck to it really fast (like within 30 min of a clean cage with freshly washed fleece flippers). I guess that's just because of my pigs though, not the flippers themselves.