I recommend the SSD to all my friends with older macbooks. As a christmas gift I upgraded my girlfriends 2012 macbook to a 512 gb one, and the computer went from barely working/loading anything to feeling like a brand new machine.
I'm in the same boat. Write speed increased 8.5x. Before, apps would take forever to load and respond. Now, it's on par with my work computer - a 2015 MBP.