After using this brush for a few months now I realize that I prefer to use a larger brush to apply my powder concealer. The flat end is great for really targeting an area (like the description says) and I do find myself grabbing the round end to blend in everything. The brushes are great quality, I've washed it several times and not lost any fibers off of it.
It does hold a lot of extra powder so sometimes I find that I don't even have to reach for my product. Also, the round end has a retractable cover but I find that it doesn't always stay in place and I have to fiddle with it.