I switched to SPDSL pedals this year and three pairs of shoes later I finally found a shoe that works well with my Shimano 105s. The Diadora shoes made it nearly impossible to clip in. If I could get my foot clipped in it was also as hard to get my foot out of the clip (yes the tension on my pedals was adjusted to the easiest setting). The Scanttante shoes I purchased worked okay but I still stuggled from time to time to engage and disengage my foot. Finally, the Giro shoes my DH recently purchased for me have been the much needed shoe - they are perfect. Cleats engage/disengage the pedals with ease. I am amazed at the difference the shoe makes.