I live in a third floor condo and, my two dogs are pad trained, but on walks they live to walk in the grass and simply pee. I thought it would be easier for them to learn how to go out on the balcony and poop in a designated place and to save me on the cost of pads. They are short legged, so I also ordered the little ramp and, they love it as well.
The clean up is easy as well and, every couple of days, I empty the underneath pail in the toilet and, rinse it out!
Great purchase!