I'm wondering if anyone else is using a mid-2012 Macbook Pro? I'm generally happy with mine since it's upgraded with 8GB ram and a 512GB SSD. I like how I can upgrade these specs even further down the line if I want. But I'm wondering if there is a lifespan for these? I mean upgrading to 16GB ram, replacing the battery, and even putting in a larger SSD if need be would help extend it's life. But are there other factors that could make this version unusable? I'm currently running Sierra, and it's generally fine. I'm curious how much more life I can get out of this, granted there are no hardware failures.