I have a Mid 2009 13 inch that is still working and a mid 2014. Was waiting for the new models before replacing the 2009, but now considering going with the 2015. Is it a mistake to buy the 2015 at this point? We are not heavy users, but use the 2009 to login for work via VPN/VDI. Looking at 16 GB RAM and 256 GB SSD. We don't need more that that for our laptops. I like the idea of having all the ports on the 2015 vs. the USB-C on the 2016. Can anyone provide some input of what they would do in our shoes? Thanks!