I have to begin this review of Shiseido concealer brush by saying that this particular category of concealer brushes is not my favorite. I prefer either the tiny and very precise brushes such as Kevyn Aucoin's (and an ancient and discontinued Sephora one) or much larger and thicker brushes that let you to buff and blend your concealer as you apply it. My issue with these small and flat brushes is that they require extra blending and many of them are too stiff (such as the Sephora #46 you see above) so their performance is questionable.
Shiseido Concealer brush is better than Sephora #46 ($17) in this regard, and if you're a fan of this brush shape but prefer not to pay the $35 for the Sue Uemura synthetic #10 (review coming soon) it might be the right choice. My own preference, though is the Hakuhodo G538 (again, review and more photos soon), as it's softer and more versatile while being cheaper. The Shiseido concealer brush is better for applying an even layer of cream eye shadow or using just the edge and tip for minimal concealer touch ups.
Shiseido concealer brush ($20) is available from Shiseido counters at most department stores.
All photos are mine.