Me and my stepdad got these for Christmas (his is the 100% pain one).
I tried the 100% Pain. One drop of it is the most pain my mouth has ever been in, it slowly got worse and worse, burning my tongue, gums, top of my mouth, and throat. It lasted close to a half hour.
Once that was done, I tried the other one. It wasn't so painful, and had a pretty nice flavor.