i've used appleguarde without any problems, but then again, i'm also pretty careful with my shoes and will only wear them if i'm not going too too far and when the weather is good.
i was about to try the SM spray, but i didn't realize the long-term effects hadn't really been established yet.
I've used Wilson's spray for my leather boots and it was great but I don't know about the sheen leather. Wilson did dry very quickly, I haven't used Apple Garde yet but heard it takes longer to dry b/c it's heavier. Who knows though, maybe heavier means better protection. Sorry I'm not of any help.