Am so excited! Having had one of these spanners in my plumbing kit bag for several years, I have at last used it in earnest. Replacing a 3-post valve. It managed to do all three 22mm nuts easily and efficiently. There was enough space to undo/do-up the nuts using a fairly decent arc.
Last time I tried, it was promising, but the space was too cramped and I switched to an ordinary spanner of some sort as soon as the nut had started moving.
In case you want to know of what I speak: