Or better yet, the i1display pro (also called i1d3), from X-Rite. Spyder products have been sub par for quite some time (although the 4 is alright).
I would highly recommend no matter what colorimeter you get, do not use the included software, and use ColorBasic 5. Much more options, and does a better job. It is free for 14-days.
Once Spectracal releases CalPC for Mac, that will be the way to go. Freaking amazing software.
I have a couple of profiles that I created last week when I got my rMBP (Samsung) screen that I will post shortly. One is a L* (this is what I use for everyday), and one is sRGB.