I was actually a little wary of the "thumb disk" when i purchased it but i never see them come up with the .100 liners and i had to have it. after owning it , i am very pleased its not sharp at all there are a bunch of milled sections on the inside of the thumb disk and its dipped a little in the middle to let your thumb seamlessly switch direction from straight across to up , its very smooth . every bit as smooth as any thumb stud maybe even smoother, i was initially a little bummed on the blade profile as i really like the traditional demko blade profile such as your s but having said that i would not trade it for anything, just another reason to try and get another at some point. nice pics i really like the look , super clean and super tough
luke-