I will recommend that you get a keyboard cover to prolong the investment. I have kept my 2011 going for awhile now. Upgraded memory, SSD, replaced battery, replaced MagSafe DC in, and am on my third charger (all for free from Apple....just this one time

).
However now my "I", and "O" key work sporadically or not at all and replacing the top cover/keyboard is a big deal and seems can only be done with a used/refurbed part. I think I am calling it quits on this old girl as I am not looking forward to spending a couple hundred bucks on a used keyboard and trying to remove/replace every internal component without breaking something else...