I have bought a few Maui Jim models by now, I must admit, with the newest addition being the Neutral Grey STG Castles. My previous purchase was the Black Corals (HCL Bronze STG) and I have had my eye on the Castles for a while. I was a bit apprehensive about the size measurements, even though Maui Jim states it is for the average sized consumer. But I think there is a difference between 'fit' and 'look'. The Castles definitely has a bigger 'look', but an average 'fit'. I have an average sized head and the Castles fits me perfectly (however, due to the frame construction, this will fit a bigger head, too). And generally, Maui Jim's recommendation regarding the fit is on par for me.
Another interesting thing is the weight of the Castles compared to the Black Corals. The Castles does not have any metal alloy in the arms (just the acetate), whereas the Black Corals has the metal alloy running through the acetate arms, making the Black Corals the heavier of the two.
I honestly cannot decide which I like the best between the Black Corals and the Castles. They are too different and yet does an excellent job in both the look, coverage and feel. A major frustration of mine is eyelashes touching the lens and the bottom bit of the lens resting too much on my cheek. I was surprised that the Castles does a better job of NOT doing that (in comparison to the Black Corals), despite the difference in the lens measurements. The Castles gives great peripheral coverage (comparing to other base curve 6 and 4 Aviators), but the Black Corals in this instance does provide a bit more peripheral coverage than the Castles.
Overall the Castles is a quality build (despite the pin hinge and lack of metal alloy in the arms). If I am forced to choose between the Castles and the Black Corals... I might just have to order another pair of both in different colours!!