I have a chihuahua that has recently decided she no longer likes to use her puppy pads, but the rugs instead. After replacing the rugs in my house (not cheap), I had to look for another solution since I live in a very urban area (West Hollywood) and do not have a yard. After spending countless hours researching the different grass options, I decided to try this since it was very cheap compared to similar products. I even considered a local company that delivers fresh sod every 2 weeks, however, at a cost of $40+/mo and $100+ for the unit I decided to try a more economical option first. I will be the first to admit that I am surprised my dog has used this potty exclusively since I received it about a week ago, no further training was required and she seemed to gravitate to this naturally. For the price, I was very surprised with the quality, it seems pretty well made, as I was really expecting some cheap junk. I don't know if they sell replacement grass pads, but the unit is so inexpensive I'm planning on buying a new one if it starts to smell or deteriorate over time (for the price you cannot expect this to last forever!) Now to the negative, it is gross to clean. If you can get your dog to just use a puppy pad, it is sooo much easier to just toss it and replace it every day, but if your dog refuses I would recommend this. After a couple days of use it started to smell (what do you expect), so I had to dump out the tray in the toilet (gross), and rinse all of the components off in the shower. I rinsed everything off with dish soap, then clorox wipes, and put the grass outside in the sun to dry. If I stick my nose against the grass, it does not smell pretty. I am going to buy some ZeroOdor spray and use that after every cleaning (which will probably be every couple days). This isn't the most efficient solution (puppy pads are), and cleaning this thing will get very old soon, BUT it is either put up with the hassle, or replace my rugs every couple days and live in filth. Obviously, the latter is not an option for me, so I am very happy with my purchase :-)