I got the 2015 12" base model (1.1 / 8 / 256) for $929 on the Apple Refurbished Store. It's been a month now and this is honestly one of the best base model Apple laptops I have ever used. The perfect compliment to my 15" rMBP.
You can wait for WWDC in a few days, if you'd like but I think no matter what Apple announces the following will still be true about the 12":
- Most portable form factor (seriously, this thing is in iPad territory. I don't even think twice anymore about taking my laptop with me when I go out -- a constant question I used to ask myself with my 15")
- Super quick to charge (I get to 100% in a little over an hour), and you can charge it off of a USB power bank (I recommend Anker's USB-C bank it's about $50 on Amazon) -- this might be one of the most underrated features of this laptop!
- Very little heat generation for most tasks, comfortable enough to keep on your lap. It did get a little warm when I was working with small-to-medium sized iOS/OSX apps on XCode. Hitting "build" every minute or so should do it.
- Quietest laptop (the new rMBP will not be fanless). If you're like me, you're used to hearing the fan kick in when watching Netflix -- using the 12" is like driving a Lexus, quiet & refined.
- If you don't continuously depend on flash drives, SD cards, USB mice... etc. this is a perfect laptop for the wireless world we are in today. QacQoc sells a great adapter on Amazon, it gives you back every port you were missing from a MacBook Air minus thunderbolt: 2x USB, 1x SD, 1x microSD, and also supports pass-through charging. It fits flush on my MacBook and is also the same color (space gray)! At $45 it's a steal compared to Apple's adapters.
- The 1.1 model is fast enough for most everyday tasks. You'll run into some slowdowns here and there if your workflow involves a lot of iMovie, Photoshop, bloated IDEs, etc. but in my experience it's no different than using the base MacBook Air with 8GB RAM.
- The butterfly keyboard is great. I got used to it in about 2 hours and if you're a touch typer, expect to see your average WPM increase on this machine.
If you were considering selling your cMBP, I'd say hang on to it during the return period of the 12". I specifically bought the 12" to complement my 15 (which I mostly use docked as a desktop). If you have a lot of high-intensity workloads you are not going to be satisfied with this laptop (but then again, would any dual-core MB short of the 3.1 i7 be sufficient?). I purchased this laptop not expecting to use XCode or PyCharm and I'll admit that I was pleasantly surprised by what I can actually throw at this machine and get away with
Seriously, this review is fantastic! The portability is a big thing for me, since I'm out and about quite a bit. I wouldn't do a ton of heavy work on it. Mainly typical college stuff (so papers, presentations). I have been dabbing in statistical software lately, mainly because of my major/general interest. Do you think the 12" macbook could handle something like that?