The bracelets on the 5821's weren't sized so I couldn't say for sure, but I had the impression the bracelet would fit very similarly to my 5811 (which fits me perfectly, I have never used the micro-adjusts except to demonstrate it to other people.)
The strap is pretty rigid and, at least when new, flexes less than the bracelet on the Nautilus. That may change with time as it gets broken-in.
I was surprised that the 5822 arrives in shipment packaging around a styrofoam "pillow" like a bracelet watch and not lying flat in a plastic wrapper like the typical leather-strapped Patek. Perhaps this is the same with Aquanaut and Nautlius models on straps? I am not sure.