The only complaint I have with the brushes is that they don't always prevent moisture from seeping into the screw-on assembly part of the brush. That results in mildew and goop building up in the base of the brush assembly even after rinsing. It basically makes cleaning a bit harder.The annoying clamshell packaging does not have any perforations to open it easily so you must use a box cutter to open it which is somewhat irritating.