Simple and well designed
This is definitely an improvement from laying my makeup brushes flat (I don't get very expensive brushes but it's still a bummer when the glue gets compromised and bristles fall out).  The rubber grippy bits are firm enough to hold smaller brushes in place, but flexible enough to allow my larger brush handles to fit  (and the variety of hole sizes is a good mix).  This breaks down easily so I can store it flat in a drawer when I'm not using it.  I'm happy with this, no complaints.
Rating: 5 stars