I was skeptical at trying a new set of inserts. You see, I may not have tried all the inserts but there is not that many that I haven't tried. I received my Protalus M100 inserts yesterday & just thought to myself "Here goes another set." but boy was I wrong. You see, I've had two brain tumors, an AVM (arteriovenous malformation) and on top of that, I had a major brain aneurysm that left me paralyzed on my right side & because of that I can't move my right foot. Whenever I walk I walk toe to heel with my right foot. Immediately upon putting on my Protalus M100 inserts, I started walking heel to toe with my right foot!!! We'll see if that holds true in 4 to 6 months of wearing them but for now, I love them!!! Thank you Protalus!!!