I've not used a Samsung before having had a line of HTC devices - latest being the one max. Pretty interested in the multi-window albeit it seems limited to certain apps? Also the refinement of the stylus and how useful it is. I love larger phones / phablets so this would be on my radar... If it ever gets released here. Surely I deserve a pity win?
I have used the S-pen on and off for years. I am now very familiar with the pen in both my Surface Pro 3 and the Note 10.1. While I currently own a non-Samsung phone, having the pen input on the phone again would be very worthwhile for my business!