I've got the pad holder as well as a frame that you tuck the corners of the pad into. They all seem to work well. I prefer to keep them on the pad because then I don't have to worry about accidents.
Hot Rod stopped using the pad in the warm weather and all of a sudden started using it when it got colder.
I have a pad in their pen, in the hallway between rooms and in my sunroom. This way we "go out" and they use it there.
Hubby just told me this morning that he's got one in his garage to "go out" also. I still take them out and they go there too. No problems with that.