I like these brushes more than the ones you get in a big pack, they seem to hold up better and are easy to see if paint remains because of the color of the sponge. I have used this with stamp pads too, very versatile.
These work as well as any sponge brush, but they hold their shape much better than others. The tips stay pretty straight and the corners sharp, even after washing.
I've used them mostly for applying Mod Podge and they work pretty well.