Had defective Gen 4 Ipad . Took to Apple Store and they confirmed defect immediately. First time in apple store and was quite out of my comfort zone. Had appointment and served quickly. I was given " brand new" and not 'New Refurb " unit. Very busy atmosphere. I got item home and started wondering: Did I get like unit or a Gen 3 replacment ? I don`t know the difference. How can i tell. Work order shows flat rate replacement @ $299. I paid $499 for my Ipad. Any ideas out here. It`s not like I have a Gen 3 and wanted Gen 4. I had Gen 4 retina display and want same as what I had. Kind inputs please. I`m a newbie.