This thread is from two and a half years ago, and people were talking about how the unibody MacBooks were an old, strange, long-forgotten artefact. I've actually still got two of them that I use all the time in 2017.
I'm a nightclub DJ and it's a very harsh environment for laptops. There's lots of carrying equipment back and forth. Then there's the smoke fluid, which can clog the ventilation grilles and condense inside the machine. People can get carried away dancing and knock a laptop over, or somebody requesting a song could spill a drink over the keyboard (or worse - throw up on the keyboard). There's no way I'm using one of my newer MacBook Pros in a nightclub, there's just too much risk.
So I buy these old white unibody MacBooks. You can get ex-business models really cheap on aBay. They don't win any speed awards, but if you put 8GB RAM and an SSD in them, they're powerful enough to run DJ software. And if one gets damaged, it's not a big deal. I'll just buy another cheap white MacBook and move the RAM and SSD across (if still working).
Here's a picture in case anyone cares. Trigger warning: so many messy, jumbled cables.