Bob is right regarding the fuzziness being one's own eyes, or in this case my own.

I decided to test out the sight by taking a photograph and this is the result:

To my eyes it is fuzzy and even worse with glasses. Luckily so far I can shoot with open sights.

Bob, any chance of swapping one or both of my RMR's for a triangle version? They are both still un-used? I would like to try out the triangles and see how they work compared to a dot.