Dear Dr. Hanslip,
Thank you for the review. You are correct that the Cleat Key would be of no use to a rider like you that uses Speedplay pedals. It won’t work with Time road cleats either but a Time/Sram-specific model will be out soon.

Triangular cleat systems like those by Look/Shimano are much more popular and ubiquitous, and the Cleat Key works perfectly with those, to quantify the critical rotation, and help any rider set up their own cleats perfectly. The materials are solid and my decade-old prototypes are still functional and precise, as are the ones used by numerous shops worldwide.