If you are buying a 2014 model, given that it seems to be non-upgradeable, I suppose the answer is "yes if you want that much memory." Whether you want that much memory depends strongly on your application needs.
If you already have a 2012 mini or earlier, I would look at crucial.com. It looks like the 2012 models are pretty easy to upgrade. Older models, I know from personal experience, are quite fiddly and difficult to take apart, so I wouldn't recommend it unless you have experience taking apart laptops and tools available such as spudgers and spatulas and extra kapton tape.
