I had a mid-2012 MacBook Pro 13". I don't personally use it anymore, but it's still in the family and it gets used as a primary computer everyday. It works great after putting a 512 GB SSD and 16 GB of RAM in it. Prior to that, it was struggling with the standard 4 GB of RAM and 500 GB HDD, but now it's a little powerhouse.
The SSD really transformed it. I've used it occasionally in the time since I got my 2015 rMBP, and the screen on the 2012 isn't that bad, in my opinion. I know it's not Retina, but it's usable -- just my opinion though. Also love that it's upgradable. I do miss that aspect, personally.