I haven't noticed anything unusual. Just an average endowment of luck. This is supported by Richard Cavendish in his book, Man Myth and Magic .He reminds us that our ancestors thought it was a powerful protection against the malice of witches and evil spirits. Like a mirror made from glass, a horseshoe made of iron would have seemed quite amazing even a couple of hundred years ago. There are also examples of a Moroccan cure for impotence using a heated horseshoe and water to make a drink.
Irish children benefit from a charm using old horseshoe nails, hen manure, and salt.
Not to be consumed of course, but hung. I realize that we are all superstitious to some extenct, and it makes complete sense to me that as humans we seek some control over our existence. Anyway, after discovering that horseshoes have the power to avert evil, I decided that my good luck was just that I had found the horseshoe in the first place. It didn't make any difference if the opening was up or down. Just having it in my possession is luck enough.