I bought the refreshed rMBP13 about 2 weeks ago and absolutely love it. The screen size, retina display, fast processor and updated SSD makes this thing almost perfect. The battery life is also amazing. This laptop is by no means heavy or big...unless you compare it to the rMP.
I watched the rMB reveal and was very impressed. You can't ignore the looks and the portability. However, I remember thinking...is it too small? Will the screen be big enough to do any work? how long will the battery last? Then I started reading the reviews of how slow the processor is and that it is comparable to a 2012 MBA. This got me worried.
Luckily, I was able to get a 1.1/256 SG from Best Buy online while they were in stock for a few hours. I received it yesterday and loaded everything that I put on my rMBP. Right off the bat I was discouraged because as I was setting it up I got the spinning beach ball as it was creating my user account. I thought that the computer was bogged down and that it was just running slowly. I hard powered it off and started again. I searched the internet and found that the "hang" happens sometimes when setting up Yosemite on any machine...not specific to the rMB. I wanted to start clean so I did a full restore and set it up again. This time everything went fine.
I installed MS Office and downloaded all of the software updates as quickly as I could. I have 100MB download at home. Installing the updates seemed noticeably slower than when I set up my rMBP just 2 weeks ago. Strike 2. I read somewhere that during the initial setup the computer is indexing files and this will slow down the computer as it is running in the background. So, I decided to plug it in and let the computer do its thing overnight.
So today with all of the updates installed and assuming all of the indexing complete, I'm using it under normal conditions. The first thing I noticed is that it is not that slow. Using Safari, watching Netflix/Hulu, watching iTunes, using MS Word...perfect. I didn't notice anything significantly slower than the rMBP. I don't keep a lot of programs running at the same time and I like to use multiple desktops and gestures to switch between them. I have 5 desktops with Safari, Mail, iTunes, MS Word and Sonos on them. Maybe I'm not sensitive to "lag", but quickly swiping between desktops shows no lag for me. It is quick and smooth. Right now, I'm typing this on Safari with 3 tabs open and Netlix running in a small window. I'm using 1440x900 resolution and everything is big enough for my 48 year old eyes (I do still have 20/15 vision though).
The other big thing I noticed is the speakers. They are amazing for watching movies or listening to music. Definitely better than the speakers that sit at the bottom of the rMBP. It's not just loud but the sound quality is amazing! You would not expect this from a small laptop. Apple definitely paid some attention to the sound on this laptop.
The keyboard looks great at night and took about an hour to get use to it. There is not a lot of key travel, but there is a satisfying click that makes it easy to type more accurately. You just have to try it out. Some people hate it. I really like it.
Having said all that, I haven't made my final choice yet, but I'm really leaning towards the rMB. The screen real estate is better than I thought, the keyboard is nice, the speakers are great and the battery life is about on par with the rMBP so far. So for what I will primarily use it for, it is just as good as the rMBP but a lot lighter and smaller. It is easy to carry around the house and use on the couch. I'll be taking a business trip to DC next week and will bring this one with me for further evaluation.
The single port has not been an issue for me. I bought the Apple USB-C to female USB-A dongle for my thumb drives, CAC reader and external HD.
BL: Performance-Good; Battery--Good; Screen real estate--Good; Keyboard/Trackpad--Good; Speakers--Excellent; Portability--Excellent. I will likely return my rMBP and keep this one...the extra space on the 256GB SSD is definitely a bonus. BTW: i bought the 2.7/128 rMBP for $1099 while on sale at Best Buy and the 1.1/256 rMB for $1120 (10% off + $50 student disc).
Hope this helps anyone trying to decide which one to get.