This is an updated review after over a year of use. I originally rated the product 5 stars and would now give it 4.7 stars.For years, I've used a scalp brush in the shower (along with Paul Mitchell tea tree products and essential oils) to clean and massage the scalp, leaving it feeling fresh and tingly while helping keep mild eczema in check. I used to just pick up a cheap scalp brush from the drugstore bin when the old one got too stiff.In early 2021, I decided to try these and was amazed at the difference. The design is truly superior, as the bristles have just the right balance of stiffness and flexibility for a gentle yet invigorating scalp massage. And because they're cut in a slight curve (the middle bristles shortest and the outer ones longest), they all engage and evenly distribute pressure anywhere on the head effortlessly, without having to angle the brush. Heavenly! Other differences: These brushes are round and cover a larger area at once than the cheap oval brushes I used before. Also, those had a shaped stem/handle on top to hold between your fingers, whereas these instead have a finger loop. I'd guess the loop roughly equals a U.S. ring size 8, but even though it's not snug on me (ring size 6), it works great, plus it conveniently enables the brush to hang on a shower caddy.Never did I imagine that a scalp brush could exemplify purpose-driven, user-centric design.So, I was a little bummed to find that after just over a year of use, two outer bristles broke off the brush I use at home (and thus by far most often) during two consecutive uses (one each time). Apparently, the plastic has become less flexible, so I expect that the outer bristles will continue to fall off. Viewed another way, of course, the brushes have lasted over a year and are still available at a decent price if replacement is necessary.