I suppose this is a personal issue, but I have been very happy
with the Speedplay frogs-they are very ergonomic for me.
the downside is that for me commuting is sort of hard on the
cleats(gravel dirt etc) I like the set up well enough for now to stick with them.
For me the cleat wears out to quick. I am on my second set of pedals because
I did not do the maintenance on the first set. And I am on about the 5-th set
of cleats for this set of pedals.

I really like how my foot floats on the pedal, as if I was stepping on an
ice cube- I have a bit of movement in my legs and knees when I pedal.

Hope this helps

TTFN