After using the GSN for a few months, I have to say that not knowing the shutter speed isn't that big of a deal. Forget it, trust the lights and just shoot. The upside of this system over others is how fast it is once you get used to it, imo. It's one less setting to worry about. Not lit, shoot. Great for ambient light candids. Fast focusing, simple, and quiet. Great people shooter at the expense of some control. I pre-meter using the guide lights, and focus quickly and shoot. People often don't even know you took their picture, and it works fine hand-held in any ambient light situation. You can control depth of field using the scale on the lens barrel, so aperture priority is more important than shutter speed anyway to me.
So much better than blinding people with flashes or annoying them with infrared auto assist lights, and canned "say cheese" shots.
