I never tried the F models, because I like the regular ones with diffuser film so much. So while I cannot speak with 100% certainty, I highly recommend the H600 with film. It reduces the "bouncing ping pong ball" in front of you, but not completely eliminating a hot spot. Nice transition to flood.
That's what I figured. I was kind of hoping someone could talk me into the H600F. I know if I cut my own diffuser film it wouldn't be perfect, and I'd wish I bought the professionally made one. I'm sure the beam would still be fine - it's just a psychological thing.. I'm weird.