I've always put screen protectors on my iDevices. The 9.7 Pro was the first time I used a glass one because the film kind felt "sticky" with the Pencil. But it also made the 9.7 feel a lot heavier or maybe less light, not that the glass protector is that heavy. So now I'm debating whether to leave the 12.9 naked or put the protector on. I really want to keep it light as possible since it's already 1.5lbs. What is your impression of the 12.9's heft with the glass protector on? Is it noticeable when holding?