Was using Shimano SPD 520 for a few years on my roadbike. Walkable shoes,
dual sided, very reliable:
https://www.youtube.com/watch?v=FFyX...6zPoymgKaIoDLA
When my MTB shoes wore out I tried road shoes and Loook KEO that a fellow club member gave me.
Couldn't get used to the flipping required every time I took off from a stop. Switched to Speedplay X/2;
dual sided so I'm happy again. Needs more maintenance than Shimano SPD; lubing the cleat and
injecting grease to the pedal body.
https://www.youtube.com/watch?v=b-rQ...6zPoymgKaIoDLA
I'm also using lightweight titanium Xpedo SPD compatible pedals on my folding bike:
https://www.youtube.com/watch?v=Fh5V...6zPoymgKaIoDLA