In the event I end up replacing a damaged MBP (2012, I7, 2.5Ghz), will a 2.2Ghz 2014/2015 feel faster on computing intensive things, or feel about the same. My impression is it should be a bit faster, but I am looking for verification. Also, how much difference would I notice coming from a spinning disk 2012 to an SSD 2014? 2015? Is the cost for the 2015 refurb versus the 2014 worth the difference? Thanks peeps!