"The Purdy brushes are good, but these are a lot less money so I thought I would have one to try. I have used it with water-based acrylic, eggshell and gloss and it performs really well with all of them. The bristles stay together and have the perfect amount of "spring" giving easy control for corners and cutting in. The Purdys have similar bristles, but are slightly too fat and just not as handy to use. You can't really get exited about a paint brush, but I reckon it's the best brush around. Can't really say about reliability. Used it for a week and it's still as good as new."