Well I sure took my sweet ass time getting back here
I have an S4, put about 20 hours in with it and it is a great helmet but it doesn't fit. I have a Bruce Campbell chin and my beard touches the front of the helmet. It does not ride low enough on my head as the rear base of my skull is not covered completely. I wear a large Shoei and that fits perfect, the S4's might run just a touch small.
Fit and finish is nice for a helmet at that price, it makes a bit more noise than my Shoei but not much. If anyone is interested I'd sell it with a clear and Silver mirror visor. PM me if interested
Jake