For 16GB, I personally wouldn't go to the trouble of trying to upgrade it myself. Back when it was just a matter of opening a door or removing the keyboard on a portable, I always got third-party RAM and installed it myself. But with the new mini, while most people say it isn't too difficult to upgrade, there is a non-zero chance of breaking something. For the difference between Apple's RAM and what third-party RAM costs, I'd rather have a little peace of mind knowing that I don't have to open up the machine, and won't have any warranty issues either. Admittedly, I would have rather had 32GB, but I don't really need it, and if at some point in the future I decide I do, the RAM will have gotten cheaper and I will still have the option of opening it up myself.