Welcome!
I recently bought my FiST, platinum white, but test drove and considered a Kona Blue one.
I think the color is very nice, and quite dynamic. It really changes in different lights, on the floor it was a very deep blue, almost purple (but in a good not purple way), almost looked like an old school enamel paint job. As soon as we got it out of the showroom and it entered the sun it really came to life, the flake started to glisten and the color of the paint took on a lighter tone in places and I loved it how it very subtly showed the lines of the car off. Also, the red accents of the ST badges and the calipers look amazing contrasted against it, they REALLY pop and tie into the rear lights and reflectors beautifully.
I passed on it because I have a vision of a white/black themed car with gold or bronze wheels and never really saw myself in a color'd option, but the level of flux the Kona Blue offered definitely had me debating things in my head.
If this was your first choice and you are simply unsure because you haven't been able to lay your eyes on it in person, I can assure you you'll be more than pleased. It damn near changed my whole direction and I was dead set on white.