I own a 1st gen Mini, and the title says it all: How much thicker and heavier is the Retina Mini over the old Mini? I don't have an Apple Store nearby, and I'm really interested to see if it's noticeable. Is it is similar to the iPad 2 and iPad 3 difference, or less noticeable? I would love a Retina screen, but I don't want the device itself to be compromised. I want to hear from people with the old Mini and the new Retina Mini to tell me their experiences.