I have NEVER used screen protectors on any of my iPhones but recently got two fine hairline scratches in my 6SP so I put the Belkin Invisiglass on it. What I have discovered is that the oleophobic coating on the 6SP is scratching and not the actual glass. Having said this I might buy a 9.7 pro if I can get over the 2 GB of ram. But....before I buy the 9.7 I want a glass protector in hand. What is working without issues of interfering with the pencil? I'm looking for the thinest least noticeable on the market.