Bests & Worsts Reviews from Amazon

I bought one set of these a little while back and they worked great for about two-three weeks, then one of the grinders stopped working so i asked for a replacement set which was sent very quickly. Upon opening the replacement grinder set i noticed some salt still in one of the grinders which means this was previously a returned item. I am just returning them (again) and looking for a different brand that's more reliable. I am hoping the item shipped as a replacement was just a mistake, but if this is the norm for this seller then they don't deserve my business.