I'm looking for a screen protector that works well with the s pen (as I use it a lot) and is very clear (I don't want to know it's there). The spigen glass tr looks interesting but I heard it's pretty difficult to apply correctly and I don't feel like spending a lot of money on something that leaves air bubbles. The zagg hd invisible shield also looked promising but reviewers say it leaves marks when you use the stylus. So I'm really confused now... I might end buying the Samsung screen protectors, available 2 at a package, which are also relatively cheap and I can replace frequently. So...any suggestions?