I both am and am not happy with hanging cages. These are 30x30 wire cages that were set up for raising rabbits. They have the baby saver wire along the bottom sides so when babies were born outside of the nestbox they wouldn't crawl out onto the ground. That design I really like.
They hang at stomach/chest level and I redid the doors so instead of swinging in and up they swing out and down, which makes it easier to reach into the cage without something bolting out.
The cages are absolutely perfect when it comes to getting beneath them for cleaning. You don't have to crouch down, slide anything out or have special tools to rake under. You simply rake it up like dirty leaves and dump it in your wheel barrel.
The biggest downside to these cages for any poultry I've used them for is feed waste. Quail are as bad as chicks when it comes to making a mess of their feed. Even with quail feeders that only allow their heads into a dish you end up with food on the ground that goes to waste. With how expensive food is I'm always grumpy when I see it wasted.
The second biggest problem is collecting eggs. While I've been really lucky and rarely have a trampled egg, they still aren't easy to collect. You have to reach in and scatter the quail to gather all of them since they're convinced that nestboxes are lame places to lay. Sometimes I don't think Coturnix realize they're laying eggs - they simply go through the motions of a bowel movement, drop the egg, and go about their merry way.
I want to set up new pens for the quail that have angled floors and completely made of small wire so I can drop 2-3 week old quail in a cage and leave them there until they are butchered or sold without having to swap from cage to cage. Or make hanging wire cages with a dirt floor to raise worms in. Getting that set up to work would be great