I have only used an AOS pure brush prior to purchasing the Simpson Keyhole 2(the only badger brushes). I never could have imagined the difference that I feel when using this Simpson brush in comparison to the AOS. Beautiful craftsmanship, comfortable keyhole shaped handle when lathering in a bowl or on the face. The hair quality when compared with other best badger Simpson brushes in person, is in my opinion somehow obviously better(color,density,backbone,tip softness) and more reminiscent of almost any other top of the line silver tip brush i've come across in person. Finally the bulb shape increases accuracy while applying cream to the face with its soft yet stiff silver tips. I now realize the biggest negative/problem with these brushes is the addiction of hoarding every style handle and hair quality that exists within this highly collectible brand...Simpson Brush's For Life!