I've been considering purchasing a pair of Allen Edmonds dress shoes (suede Neumok or walnut Strands) and I got some advice from a sale's person that I'd never heard before. He said that some heel slippage on a brand new shoe like what I was considering is fine because the stiffness of the leather sole is trying to keep the shoe flat, which pulls the heel back and causes the slippage, but when the shoe is broken in, this wouldn't be an issue (the explanation might be a bit off as I didn't quite understand it). I was a little bit skeptical of what sounded like an "it'll be fine when it breaks in" pitch, but the explanation sounded very plausible, it seemed to be a reputable shoe place and sales person, and I don't have any experience with shoes like this (i.e. leather soled). Any advice? Is a little bit of heel slippage (i.e. a bit of movement up/down, but by no means coming out of the shoe or anywhere close to that) to be expected or acceptable with new shoes that have leather soles? And is it likely to subside after some wearing? Also, I was experiencing a bit of what I'd call "scrunching" over the back end of my toes, where the shoe bends when flexed/walking. Is that something that I could expect to go away once broken in?