So, I've only had my girls a month, and the poop is really the biggest surprise. I have a cheaper cage (because I didn't know any better) and I have no lips in my shelves, the poop just rolls off and collects on the floor, or across the room, where ever it bounces to. The other day I was doing my daily vaccuum, and the girls got excited because they hadn't had dinner yet, and were impatiently waiting... Well, they hopped around the cage, up and down the levels, and as they skidded to a stop on the top level all the poop flew out and landed, well, on my head!
It literally rained poop!