I have had the rMB for some months, and I have to say I have not gotten used to the rMB keyboard. It feels hard on my fingers, and also gives more typos. Perhaps it's because I use an Apple Wireless keyboard most of the time. But since these are Apple products, it should be possible to switch back and forth (continuity...). My wife got an SP4, and I prefer even that floppy keyboard. I love the single port (yes: the fact that i just have to disconnect one wire when I leave my desk as opposed to four with my MBA is a great advantage, not a disadvantage), the performance is great after upgrading to 10.11, the trackpad is excellent (much better than SP4, since I mentioned it before), the battery life is OK (about 8 hours). But the keyboard... That's where I feel the compromise.