I used the one that came in the Christmas gift set. The brush is rugby ball-shaped and very large. I usually use mascaras with smaller brushes like Clinique or Opera, so it was difficult to apply at first. However, thanks to this brush, it gives a lot of volume. It's rare to get this much volume. It doesn't clump even when layered, but it does make my lashes droop. I used Kate primer, two coats of MAC Stack Mascara, and then applied Clinique mascara as a coat, and it stayed beautiful until I removed it. I like mascaras that give a lot of volume, so I'll try using it for a while.