I recently got myself a 2015 13″ MacBook Pro. I had it customized with 16 MB of RAM and a 512 GB flash drive. It’s a nice and fast machine. The Retina display is also very pleasant to the eyes.
I put some computational applications such as Mathematica 10 Home Edition and Matlab 2015 Home Edition. They both run great with the amount of memory and the 2.9 GHz dual-core Core i5 processor. For testing, I used the MacBook Pro as my main computer for a few weeks. The Retina display helps reduce eye fatigue, even if the fonts are small.
This is a great laptop. I only wish it can be configured with 32 GB of RAM like those workstation-class PC laptops.