I use it and buy it off ebay. Mainly I use it for my bun Scooter who had a bad break in one of his hind legs, which now sticks out at a weird angle, and he can't clean himself properly. He has one of the rigid plastic dog beds as a litter tray, as they are easier for him to get into, and I have vetbed immediately in front of it for when he comes out after a wee, because it kind of mops him dry. I also have some in his play area, and his pop-up tent all lined with it, because he could potentially get carpet burns from his leg dragging along, but the vet bed provides soft support for his leg and keeps him dry.
For my buns in puppy pens, I have large pieces cut to size, that can then be changed and washed as required.