I like 'em!
You can wrap the PVC pipe to make it "crawlable" you can easily hang things from the frame before putting the mesh on. You can decide for yourself what side opens.
If you want to reuse a cage for a new chameleon, it's a simple matter to run the whole mess through the "sanitation" setting on the Dish washer.
You can buy an extra mesh and accomplish a deep clean by simply switching meshes every few months without overly disturbing your chameleon.
The bottom is completely mesh so it's easy to put over a drainage drawer.
You can even build a frame to hold it, so the bottom is non-supported over the drawer, which means if your chameleon falls, it will not have a hard landing.