I ran a middleburn RS7 Uno crankset in 1x7, 1x8, and 1x9 configurations. I always ran a jump-stop because they were cheap insurance and I figured it would never pop off to the outside. Well I was wrong about that. Even with a decent chainline, taller SS ring teeth, and a shorter med cage Xt rear derailluer with no excess chain I would still lose the chain to the outside at times. It was always a predictable event and Involved a rutted bouncy downhill where I was hammering away in a 32x11 or 12 combo. Even with a shortened chain it would still pop off. I finally just popped for a Pauls chainguide and haven't had an incident since. Thats just my experience and others don't seem to have the issues so go figure eh?