I still have my base model 11" 2010. (64gb,2gb)
A bit on the slow side, but still has its uses.
The battery life is down to about two hours or so, depending on what I am doing.
It is mostly replaced by an iPad Air 2, as I have a Mac mini for the heavier lifting.
I keep it around for the keyboard mostly which I love.(wish it were backlit!)
I found it runs much better on elcap than Yosemite, although I don't use it all that often.
Still a good laptop though, and does very well for its age..a good buy I think, have been really happy with it. And as I was only expecting to use it 3 years or so I feel I got more than my money's worth.
Thought about buying a new ssd and battery, but not really worth doing to be honest. Would rather put the money towards a new retina MacBook. (No pressing need for one, but maybe in a year or two.)