We've got a pair of 2012s. One from August. Another from October. The August build had an LG display the latter... A Samsung. In November, screen retention on the Lg model indeed became an issue, manifesting itself very quick and with longer and longer retention times, each time I'd switch between apps, browsers and the desktop or M/C. Took it to Apple. He ran his test. It passed. He didn't care. Replaced it within 24 hours. (Dropped @ 11am, picked up the next day early afternoon.). Samsung display. No issues since. We've just purchase a 2013. LG. Gorgeous, fast...almost three full months without a hint of IR. These are my favorite computers I've ever purchased. Three decades. They're hands down, the absolute pinnacle of mobile computing. The power. The battery. The display. Speed and I/O and weight, form factor...the list goes on forever. They're absolutely awesome. I'm sorry you felt at any point they were an 'unsafe' investment. $105 savings on Apple care @ .B&H or Amazon. Both legit. Bumper to bumper for three years. You'll want a new one by then and easily recoup 50-60%...+ pending when you sell. Next year, my two '12s will go to be replaced by next fall's release. They're amazing for the package and definitely a 'safe' buy. You don't have to buy the A/C warranty immediately. You've got a year. Wait til the week before and buy, again from an online 're-seller' that's authorized (B&H, Amazon, some eBay folks. Etc.).
Didn't mean to ramble but seems tend to be emphasized, embellished and 'distorted' on maniacal forums. Don't read. Use. You've got a liberal return policy but you won't need it. Hands down, best computer made, in history.
(While I patiently await my March arrival of my new MP

)
Quick mention/edit. Couldn't be a better time. Now they're up in the refurb section on Apple.com, you're gold. Save a few hundred bucks. Returns at Best Buy, etc
J