For me the issue has been that I've ordered a couple of things, get a shipping notification, clean out the garage in preparation... and then the package arrives with the main ingredient missing. A big part of it is that I'm living proof that Murphy's Law really is a law. The two big ones that caught me were the Mini Swirl Killer back order and the ceramic coating kit. What would be nice is knowing when the box leaves, what didn't leave in the box.