For those that have installed a plastic SP (like the Samsung one), do try to change the SPen tip to the white/grey one.

This white one is a harder plastic meant to mate with the soft SP.
The pre installed black one is meant for hard surfaces like the unprotected screen.

Found this tip online, tried it and it really does make a difference.

http://www.androidbeat.com/2016/08/best-sa...-7-tips-tricks/

"Samsung has included two different S Pen tips with the Note 7. They are both meant for different purposes and not a replacement piece that many people might be led to believe. The softer S Pen tip is to be used when you don’t have any screen protector installed on your Galaxy Note 7, while the harder tip is meant to be used when a screen protector installed on the display."

Mine is Black Onyx, and the SPen has a black tip out of the box.
I changed it to the white one.