I hate them. I tried using them for a year, then went back to Power Grips.
I guess they are OK if you are just going to sit in the saddle and pedal for extended times, without having to dismount, but in my opinion, at least, riding with them while touring, or in town, where you will be stopping and even dismounting often, is a Royal Pain. Plus, you have to wear special cleated bike shoes, and carry an extra set of regular shoes to wear off the bike. I do a lot of touring, and vehicular riding, and I usually wear my hiking shoes, or tennis shoes. Sometimes I even wear my combat boots, depending on the weather and terrain.
It is probably just a matter of what kind of riding you do, and your personal preferences. Clipless pedals just aren't for me.......