So in April (last month) I bought a second hand iPad 4 (16GB WiFi + LTE / full box + another 4 months left on warranty, mint condition - like new) and it was my first iPad, I was so happy ! After using it for a couple of weeks I saw that the OS (7.1) lagged at basic tasks (opening NC, rotating orientation in the Messages app, closing apps in the Multitasking UI, scrolling in some apps like IMDb and 9Gag, etc.) and that drove me insane because my 5s was smooth. A quick fix was to turn on the increased contrast option but hey, I like the transparancy ! Anyway, I thought that the A6X was not powerfull enough to handle the transparancy & animations at that resolution (2048-by-1536) so the next day I bought a brand new iPad Air (16GB WiFi + LTE) from my local Apple Reseller and guess what? Same problem ! C'mon Apple ! I like the look and feel of iOS 7 but this is pathetic ! My old iPad 4 is now used by my father. It was a gift from me so no way I will take it back from him to sell it and get some of my money back. I own an iPhone 5s and there is no lag with the OS. It truly seems that iOS 7 isn't finished for the iPad. Of course, before purchasing the Air I did some research and everybody said that the A7 chip is so damn powerfull that nothing can stop it. It really is, I know it, so i thought that upgrading to the latest and greatest will solve my problem. It didn't. Apple really needs to get iOS 8 just right for the iPad this year. I was really happy with the 4th Gen and I had no real reasons to upgrade to the Air. Sure, I like the new design , the improved FaceTime camera and the A7 "future proof" 64bit CPU, but that is not enough to justify an upgrade. For me, at least. Now I'm sticking with the Air for 2 years. I love it (besides the lag, of course, but that will be fix in fall with iOS 8. I hope) This is my upgrade plan for the next couple of years : 2016 - iPhone 6s / 2016 - iPad Air 3 / 2015 - Apple TV 4 / 2015 - rMacbook PRO 15". BTW, both iPads were set up as new, I did not restore from any back up.