I will give props to Samsung for constantly upping the ante when it comes to S Pen functionality. However, having owned a Note 3 I didn't actually find myself using it all that much.
BUT now that I am a free lance writer who is often emailing myself source articles I suppose I might use the pen more often, assuming I were to win. The lack of a removable battery is a deal breaker for me, since I need my 10,000 mAh ZeroLemon battery case and the 7 day battery life it offers.