It does keep their nails down My tiles ARE pourous because they haven't been treated. They're rough and still have the nicks and grooves in them. Looking back now, I'm probably going to get some treated ones when I get a bigger cage for her, but they work for now. After she goes, I just spray down the area with Virusan and wipe it down well.

Personally, my fave part is the heat they hold. She doesn't even need a basking rock, so just spreads out right on the tile lol