I use spd rather than spd-sl for all the reasons you mention. When (micro)touring or just on a daytrip it is so nice to be able to walk around a little bit. Not to mention being able to confidently bring my bike up the stairs to my house without breaking all my bones.
Having said that, I don't suffer from the dreaded hot zones even after 4 hours or more. Some people don't like spd because you don't get much of a contact surface which can cause you to feel the spot where your foot soles are over the cleats.. Ymmv.
I use spd rather than spd-sl for all the reasons you mention. When (micro)touring or just on a daytrip it is so nice to be able to walk around a little bit. Not to mention being able to confidently bring my bike up the stairs to my house without breaking all my bones.
Having said that, I don't suffer from the dreaded hot zones even after 4 hours or more. Some people don't like spd because you don't get much of a contact surface which can cause you to feel the spot where your foot soles are over the cleats.. Ymmv.