I'm a tad biased (owning some M530s) but I do like double side ones - purely because whatever side of the pedal is upwards I can clip in - it just one less thing to worry about If I was bothered about every little gram I'd probably go for single sided ones. The A600 are within a few grams of Shimano's top end SPD-SL pedals, so they really are high end
As for falling off at the lights - you will, that is a given! The only question is when it will happen. It's known as a 'clipless moment' and comes to us all at some time
Ohh ok, so which ones are single sided? I'm getting a bit confused now
Haha! Noooooooooo it just can't happen.