Well, the shoes were comfy for about five hours with moderate walking -- they started rubbing a little on the outside of my toes last night. I think they might just need a little easing into. I'll try the Body Glide solution MaryK recommended next time I wear them!
Funny how shoes can seem perfectly comfortable for an hour and then go downhill from there. I think these will be fine in time -- I have others that have done something similar at first and then I've broken them in!