This is awesome. My first ride with clipless pedals and I am sold. I can't believe how much better it is. I'll definitely have to give it a few more rides and many more miles to see if my knee pain sprouts up, but my first impression... incredible.
I'm gonna have to go and find some hills. I was going to switch my crankset next, but I may wait awhile longer now. Simply switching to clipless pedals seems like it may do just as good a job at leveling out the hills as a 26 tooth granny. Of course that is just my initial impression and I am fairly new to road cycling. But the difference is night and day.