Remove second floor in Fn or keep?

So I have a double model FN cage and I have seen a lot of chin owners that don't have that middle floor and just make it one large cage. I was just curious as to how everyone else likes to use their Fn and if their chins prefer the second floor or prefer the jumping room? Really the only thing that stops me is the fear of having one of my chins fall from the top of the cage all the way down to the second floor.