Sharpie just arrived at my part of the globe, they were not news to me but the reputation they have was quite remarkable so I had to try. For regular stuff they are great, I can find them easily, lots of colors and options but not great for rough conditions as mentioned previously.
I don't really need anything more than a Sharpie for my day to day messing around but I came across a couple of situations where a industrial grade marker might have been better. Didn't knew about the metalic color having to stay up side down, just turned my one up (or down depending on your point of reference).