Dual Sided SPDs...
...Are great!
Last night I needed some chew, but didn't want to fire up my WRX to make the 1 mile trip to the store.
I also didn't really feel like putting on my cycling shoes, I already had a perfectly good pair of sandles on my feet. (sandals are best when watching baseball)
Just turn those pedals upside down and violla! I'm on my way.