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I'm not sure if it's just MY dry eraser board, but the green, blue and red markers leave on-going stains on my board. The eraser doesn't respond well to either of those colours, and the cleaning solution doesn't work with it either... HOWEVER, everything works with the black marker somehow.
I have no idea how to rate something that only works 1/4th of the time or to even know if it's an issue on my end. So buyer beware?
These have very chiseled tips, kind of unforgiving and make either a really thin or really thick line depending on how you hold it. I guess I was looking for something softer with a medium thickness line