I still use a late 2008 MBP as my personal computer. I have a top-of-the-line 2014 model at work, but it's really no faster than the old one from six years ago.

I still use a late 2008 MBP as my personal computer. I have a top-of-the-line 2014 model at work, but it's really no faster than the old one from six years ago. I'm going to buy a new one when the broadwell chips make it into the MBPs because the old one is starting to fall apart, but purely in terms of performance there's essentially no reason ever to upgrade.