This is a great product.
I highly recommend these fleece liners.  They are very absorbent and get better with every wash.  It is important to follow the instructions on washing a few times before use.  The only reason I gave 4 stars instead of 5 is I wish I did not have to use puppy pads under it.  After a couple days, the pee will soaked through, but I have found that once I started using a small flat pan as a litter pan (with a small amount of Yesterday's News), this reduced the soak-through immensely. My little guinea preferred an area to pee in so I placed the pan there and moved the water bottle to that location as well to catch the occasional drips from it as well.  Now the only places that typically soak through are under the tunnel and box.  I ordered 2 liners so I always have a clean one ready.  I sweep the little poopies up twice a day and thoroughly clean the unit twice a week, although since I added the litter pan, I could probably go about 5 days before doing a thorough clean.
Rating: 4 stars