Hey Paul - I have a Kodak Duaflex II and I love it. I keep with the sunny 16 rule, and that seems to work out with me. In fact, I don't have a light meter (I know!) so I generally do all my shutter speeds in my head according to the light.
You also don't actually need 620 film - just respool some 120 onto those lovely metal spools and it'll fit perfectly.
Oh sorry Paul - I had replied before I finished my coffee that morning . Yes, the kodak cameras are generally around 1/30.
Dug - it's sunny here! Well, sunny then cloudy then sunny then cloudy... you get the picture. We get a bit more sun in the Kootenays than on the coast .