This same brush comes in all synthetic form as well. I don't think I've tried any of their synthetic brushes.... Yet!
It may seem like just a pencil brush, but it is a bit larger, and I find it really versatile. It's perfect for outer v, crease definition, even cut crease, softening eyeliner, it's just a really great brush to have. I've had mine for a while and it's never shed or bled either. It isn't the softest, but it isn't scratchy and without the courseness I doubt it would be as functional. I have softer eye brushes but they tend to do better at blending. I think three shadow brushes are essential and sufficient- one for lid color, one for blending, and this one.