I am using the M-Edge one currently. Although it is quite wider than the DR800 itself, has a wide spine too, kind of heavy if you hold the reader by one hand, and it completely covers the power switch, it definitely offers much better protection than the included nylon pouch, for $20!
Regarding the M-Edge, I actually cut a small hole on the bottom-left strap so that I can access the switch with my finger. So the biggest "design bug" is gone! :-)
