Well, I like my road shoes and regular Speedplay pedals. If am going somewhere (like on a tour or a ride with a long lunch stop) I bring a pair of very light weight Keen sandals that my husband can fit in his Carradice bag. I could put them in a jersey pocket if I had to, since i can only fit a very small bag on my bike. And, there are cleat covers for Speedplay cleats. I never walk anywhere in my shoes without them on. That ruins the cleats. The covers eliminate the slipping, etc.
I rode on SPDs for 2 years. They were OK, but now, when I ride my errand bike or my mtb, which both have dual sided pedals, my knees kill me because of the no float issue with SPDs. I thought about Frogs for my mtb, but I am not good enough to feel comfortable without having the flat pedal option (and probably never will be!).

