I recently purchased the Tab S4 pen because I thought performance would be the same in a round barrel. This thing is a downgrade: - Higher IAF. I couldn't believe this one, but it's true. - S4 Pen doesn't taper as much towards the tip so you can't draw on as much of angle. - Smooth plastic doesn't grip as well which results in slipping. - Feels cheaper. When drawing you can hear plastic shaking around. I don't understand how tech gets worse moving from one generation to the next, but there you have it. Crazy. EDIT: Well I wish I could delete this thread being that I now believe I got a cheap knock off. Never thought I'd fall for it!