Im looking to get a set of either looks or look style (shimano dura ace/ultegra spd sl). I came across a really good deal on ebay for some 2003 A.5.1 for 20$, no reserve as far as I can tell. I was wondering what the difference was between all the look pedals? is it mostly weight? I looked at the look website and weight seemed to be the only major difference between models. Also, do you think my lbs would let me try out some pedals? Ive never used looks, use spd-r's, so I would like to try them without buying them blindly. LAstly, anyone have these pedals? any problems?