Eric wrote a review of Shimano SH56 SPD Cleat Set on April 18, 2014
Familiarity: I've put it through the wringer
Fit: True to size
I was surprised coming from SH51's to these that the float difference is very noticeable (Shimano claims 0 degrees). Much prefer no float for power transfer, and these save me from going to SPD-SL, since keeping all shoes and pedals in the quiver SPD is prefered.