If you're using it with flash outside, I find the Sekonic to meter 1 to 1,5 stops too low, always. VERY annoying and kind of make the point of it go away. I have learned to just set my camera a stop faster to compensate. But I would have preferred it to just work. Haven't tried any other types, but I have tried two of the Sekonic (308) and they did the same thing.
Did you calibrate it with your camera ?