Got my shoes over the weekend and both sets of clipless pedals:
CB Candy SL (blue):
I tried the A520s first. No falls or close encounters with the ground in my 26+ mile test in mostly rural areas. There were several times I had trouble clipping the left foot in when starting off.. sometimes to find the single sided pedal was inverted... and other times just because it took me a while to find the sweet spot. Meanwhile, I can pedal with these... even not being clipped in.
My first observation was that it felt good to have the connection to the bike. I've had several instances riding platforms where bumps in the road almost took my feet off the pedals. Secondly, I found that I could generally go up the hills faster and in a gear or two higher than normal... as long as I remembered to lift on the upstroke instead of just powering down on the downstroke like I've done all my life.
I also noticed that acceleration was notably improved with the ability to provide power on the upstroke, unlike on my platforms. Thus far it takes a conscious effort to power the upstroke.
All that being said, I felt like I got more of a workout with the clipless pedals than with the platforms.
For my type of riding, the clipless seem to provide a benefit for me.
Tomorrow, I plan to change out the A520s and try the CB Candy SL pedals. First though, I gotta change to a black pair because I don't like the Berry Blue color with my blue bike.
Clipping out turned out to be no big deal. I started out holding onto something in the garage while I tried to clip in and out a few times. Then a ride around the cul-de-sac with just one foot clipped in. Then a short ride around the neighborhood with both feet clipped in.
Thus far, riding clipless has been a total non-event even though I was expecting a 0 mph crash or two. I'd even planned to try them on my older hybrid first.. but didn't have a pedal wrench and my 15mm open end wrench was too large to get the hybrid's pedals off. So I chanced it on the new bike and all went well.