Just because I plan to draw pretty heavily and I love a pristine screen, I picked up a Skinomi tempered glass protector. Just installed it this morning in the bathroom after a shower (because steam getting dust out of the air is your friend) 
It feels great and I have no loss of pressure sensitivity. It does add to the "slickness" of the Pencil on glass, but I actually like the gliding feel a little better that way. We'll see how it fares. It was $16 on Amazon -- no bubbles, super easy install (again, hot shower in closed bathroom, then apply). Now I can press a LOT harder and not worry about damaging my screen.
I've still got AppleCare+ but I really like my gadgets scratch-free. I'm interested to see heavy use cases over the next six months -- I'm not sure exactly when the tip will need replacing or how to tell.
It feels great and I have no loss of pressure sensitivity. It does add to the "slickness" of the Pencil on glass, but I actually like the gliding feel a little better that way. We'll see how it fares. It was $16 on Amazon -- no bubbles, super easy install (again, hot shower in closed bathroom, then apply). Now I can press a LOT harder and not worry about damaging my screen.
I've still got AppleCare+ but I really like my gadgets scratch-free. I'm interested to see heavy use cases over the next six months -- I'm not sure exactly when the tip will need replacing or how to tell.