This is not a scientific test, just a little experiment I did. My G-9300GB arrived today. I don't know how I feel about it. I really like the other two I have, so I may end up selling this one, but I like the fact that I have all three and I feel this is going to be a very successful module for Casio so I kind of want to hold onto it even if I don't wear it. Can always mod it or use it for parts in the future.
I wanted to test the legibility in low light, so I simulated this by taking tripod camera shots with different shutter speeds.
When under a flash, they all look pretty:
In normal room light, the standard is obviously the most legible, followed by the smoky gray, and last the gold/black
In dim light, the gold/black is starting to get frustrating. The other two are okay, with the standard coming out on top as expected.
My conclusion is that the gold/black is the least legible of the three. Not to burst anyone's bubble. If you don't have a problem with yours, maybe your eyes are superior. I kind of wish it was brighter. That gleaming gold circle also distracts from the display and overwhelms the face of the watch. It still looks very nice in normal daylight, though, and is the classiest of the three. The gold does not look cheap or blingy at all.
As for the bands, they feel the same (no difference between the carbon fiber band and the standard resin that I can tell).