When you wet them, you get a nice foaming action that lasts for quite a bit (unless you keep running it under water). I have used just one to clean a small bathroom (just sink and toilet) more than once time! I often just rinse it off and save it for another use. I've gotten 2-3 uses out of most. If you have a larger job, you'll probably only get one use.
The best part of it is that when you're done, you can just throw it out. Using these is pretty much a no-brainer if you like to get things done effortlessly and quickly!!