another curious question about screen protectors.... does anyone have any experience with the 'glass' screen protectors like Zagg offers or others? i have no experience with them (glass) and wondering if they are worth the money for my new air 2? or if a product like iLLumiShield is as good? (which i do have on my cell phone and love it)...tho i prefer the 'feel' of my ipad glass screen so that's why i'm asking...