I use the pooch pads for my two dogs. Between the two of them, obviously their is a lot of peein' goin on, but they always last the whole day. I have several pads, so at the end of the day, I remove the soiled ones and replace with fresh while the others are being washed. I find these pads absorb odors really well so they don't get stinky. The surface also seems to dry pretty quickly too, so they aren't walking through wet pee everytime they go on them. I haven't found that they leak at all - maybe it depends on brand, or the amount of urine on the pad? I'm not sure, haven't run into that yet. Ruthie and Oscar would sometimes play with the disposable pads I used to use - they don't even bother with the washable pads now.
I wouldn't feel comfortable buying used pads myself... not sure why, cause I'm sure they're clean. But still...