I have the 2015 iPad Pro 12.9". I use for web browsing, email and word processing. I like the look of the new 2017 12.9" pro's but, do you think it's worth upgrading? Bare in mind I'll have to sell my current 12.9 Pro if I do sell and that'll mean if I don't I'll get less next year? iPad Pro 12.9, worth upgrading?