1. They dont work well with Look bindings because the heel piece gets in the way you can never step all the way flat. I just left the small riser up to deal with the problem. Flat ground will suck because you're angled forward and not flat.
2. Check EVERY screw on them before you go out for the day, they get loose and fall out ruining your trip!
3. I've used them many times on long tours over all types of terrain and conditions they honestly work great, or deliver what they promise anyway. Make them as big as possible for your binding so you don't twist out of them. and then clamp them to your boot as tight as possible as well. If you don't get this stuff dialed in your treck will be a nightmare.