I tend to agree with Jimmy here. I think slower paces can actually increase injury risk, at least for me, because my form is much smoother at (relatively) faster paces, and it becomes easier to adopt good posture too. Seems like everything kind of falls into place for me between 8 and 9 mm pace. I wonder if it might not sometimes be good advice to have beginners just run short distances at somewhat faster paces, say 9mm pace, and then, once they feel good at that pace, begin to add distance. It's also a good way to increase cadence without consciously manipulating it, which seems like a dubious practice to me. Just my two cents, although I don't have either of you guys' experience, so I'm basically just talking sh!t.