The Star is a straight through sizer. Insert a bullet, pull the handle, it is sized and lubed, and it pushes out the bullet ahead of it. Much faster than the in and out sizers others make. Also, for each caliber only one punch is needed, a flat one as it acts only on the base of the bullet. With other sizers you need a nose punch that fits the nose of the bullet being sized.
Others say the Star is the Rolls Royce of sizers. I concur.