[cypher]

I had one of those years ago, it might be ok on substrate but I only used it in the playpen as it doesn't sit on a shelf or hang on bars well, it is fairly noisy too.
The metal pin in the middle is a real fiddle to get out for cleaning, probably the thing I liked about it least.
If your main problem is Jessie filling her wheel with substrate I'm not sure that would help, it didn't take Zen long to fill a silent runner before I put it on a shelf so one of those would probably be easy to fill, just harder to get it all out again!