I tried Look pedals, M'eh! Didn't do a thing for me for the 2 or 3 rides that I did in them! Ended up giving the $100 to a friend that wished he had Look pedals. I like the SPD pedals cause they are more stable support while supporting the weight of a tandem at stops.
I look at the price of shoes and geeze! $200 for a pair of roadshoes? I paid $70 for my current pair and $50 for the pair before that. I have to say that I performed better in the $50 shoes cause I was in better shape!..But I do wonder if I had stuck with the Look pedals, would I have climbed better, faster, stronger? I could have been a contender!