Considering the general awesomeness of Sephora Professionnel Platinum Foundation Airbrush #55 and #56 , I expected the accompanying concealer brush, Sephora Professionnel Platinum Concealer Airbrush #57 to be of similar quality. It isn't.
Now, the Sephora Professionnel Platinum Concealer Airbrush #57 is not a bad brush and it's in my regular rotation (I was my concealer brushes after every use), but it falls short. While the two airbrush platinum foundation brushes are very sturdy and densely packed, the #57 is a bunch of hairs short of perfection. It buffs and blends my concealer adequately, but not as well as the amazing (and much larger) Trish McEvoy The Point brush; since the #57 is completely blunt, it's far less directional and precise than the Dermablend concealer brush (review coming soon). I do prefer the Sephora #57 to MAC 217, then again, the 217 is an eye brush that I borrow and use for just about every small blending job. In any case, the #57 is softer (newer MAC 217 brushes from the last couple of years are often quite scratch, unlike their predecessors).
Bottom Line: shrug.
Sephora Professionnel Platinum Concealer Airbrush #57 ($24) is available online and in store.