The Wooster website claims it's been a top-seller for over 15 years. The Wooster Company itself has been in business since 1851.
I look at a few things when I am reviewing a brush: Bristle Type, Handle Type and Bristle Loss.
Bristle Type: Nylon and Polyester
Nylon/polyester blend brushes should be a staple in your brush collection because they are suitable for both oil and latex paints. The combination of nylon and polyester synthetic fiber allows the brush to keep good flex. If you clean these properly after every use they should last a while.The purple nylon makes it recognizable as Wooster.
Handle Type: Sealed Maple Wooden Handle
I prefer a wood handled brush, They are more comfortable in my hands, and they clean up just as well.Bristle Loss: 10/10
There is nothing more annoying than trying to get a loose bristle off a wet wall. Darn near impossible with short fingernails. (I have only found one solution for this: Stop buying cheap paintbrushes.) Wooster is typically great for keeping everything in place though, so I'll give them a 10 out of 10 on this one.
Overall, this is one of my favorite all-round brushes. They cut in well, and keep their shape.