I didn't check the links, so, maybe someone posted this already.

I had the big swing thing, sturdy, not the type you move from room to room, and J like that. THEN, I had a portable table top one, I think it was called an Aquarium Swing, and it rocked! Very easy to move room to room, VERY sturdy, and it could safely be put on top of a table...which was super nice.