I started using Looks on my uprights in the mid-80s when they first hit the market. There weren't any shoes available at that time to accept Looks and we had to drill our shoes to mount them.

My wife and I changed to SPDs about 2001 after a couple of extended tours where we saw the need for walking type shoes with recessed cleats. We had held back because of the thought of changing pedals on 4 road bikes and two tandems. That's 8 sets of pedals to buy!

Then, this year, I started riding a bent after prostate surgery and began with the SPDs. I had a little trouble unclipping and a friend suggested I try his bent with Frogs. I was sold and immediately became a convert. I've since added Frogs to one of my tandems as well as a road bike.

I love the float of the Frogs and the ability to unclip without wrenching a knee is a plus. Also, I've noticed that cleat adjustment isn't very critical as long as you get the fore and aft set and the heel doesn't hit the crank. I've adjusted my Frog cleats in under a mile where I've carried tools to adjust other systems for days until my knees felt right.

Lastly, as far as numbness, I've never experienced it with Frogs where I did have a little with SPDs. BTW, I'm riding a VRex.

To me, the question isn't whether to use clipless or not, but which ones. I chose Frogs, but it's whatever a person feels comforable with. YMMV

Happy New Year!

-dennis