I just wanted to say a few things in defense of the 2012 cMBP. I think I ultimately made the right choice in getting the 13" rMBP, but for my particular needs and situation, a 2012 cMBP would not have been a bad purchase either.
The big hurdle for me with the MBA and rMBP was the soldered in RAM and general difficulty in upgrading those machines as I need a machine asap and simply do not have the funds at the moment to get the specs I would prefer.
As well, I know other's experiences may be different, but I have had multiple horrid problems with Apple and batteries in the past, and the glued in battery was therefore also a big turn off.
I am not happy that I am now locked into 8 GB of ram forever, as I know I may wish I had 16 GB in a year or two. I have 8 GB on my current MB and already sometimes max that out when running virtual machines with other background tasks running.
With older models, I could make do for a while and then easily upgrade the RAM. Not so now. (I plan on upgrading to a new machine again in a couple of years and passing the rMBP on to my wife again.)
As well, with the 2012 cMBP, I believe you can ditch the SuperDrive and install a caddy so that you can eventually run 2 drives, going up to 2 SSDs with relative ease, or perhaps 1 SSD and 1 HD, allowing for massive storage And you can keep upgrading as prices fall. That is a pretty powerful thing. I have already bought a OWC caddy for my 2008 MB by the way.
I am not saying the 2012 cMBP is the better machine. I am just saying that it is not a crazy purchase for some people, especially those who live primarily in a world of text with some light graphics and systems work, and who like to tinker with hardware and upgrade over time. For me, the price point was just a little too high for what you were getting.
There were a number of great selling points with the rMBP that made me ultimately change my mind, but the killer feature was the retina. A sharper display is very important to me and could make a big difference in my day to day experience.
Again, I am not saying that the cMBP is a better machine. I am just saying that in some cases, there is greater value in having a MBP that you can still tinker with and with which the performance is still good enough for many people's needs.
In a roundabout way, I guess I am also saying that I would have preferred that the rMBP had a larger form factor yet remained user serviceable. Then this choice would have been a complete no brainer for me. I don't think that is the direction they are headed in though...
Having said all that, I am still on pins and needles waiting for my new toy to arrive!
