As with all micro thin computers that have no ability to update the two basic components - RAM, HardDrive/SSD, and also the battery - it makes it a disposable computer. When it a component breaks you throw it out, unless under warranty.
Retina screen looks fabulous, but the pixels are really useless at that small resolution. - A 15" already tires your eyes significantly, especially if the detail is so fine and there is a reflection in the screen. So it's probably ok for casual computing but not day long hours. Get a second antiglare 24"+ color calibrating monitor for that. Another issue is untested colour accuracy of the retina display - does the display give us true 32Bit color ( 10bit per pixel or higher)?? and can it be accurately calibrated? - Photography, design, and video all need this.
Back to Hardware:
As I have burned out 3 macintoshes since the intel switch, don't expect the reliability of the pre-intel era. The G4 power macs and laptops are still running strong even though they are now left behind. (The 12" G4 was the best laptop ever for reliability.)
But not Intel Macs, I was fortunate that with my intel based 27" i7 iMac 2011 and Laptop 2008 MBP that I purchased the extended warranty. The laptop was in its second last month of warranty! And they burned out while rendering video laptop and using 3D program iMac. Also an iMac (Sept2006) fried due to excessive heat while using google earth - but no warranty - SO word to the wise ALWAYS buy the extended warranty of any new mac because the reliability is not the same as it was in the G4 era. That means the price is always about $350 more than advertised for the new Retina Display Macbook pro- An iMac is only about $170 since its internal parts are all separate.
So ALWAYS buy the warranty, I cannot say that loud enough, as the overheating design flaw is likely not be going away with the thinner and faster and hotter laptops.
2nd piece of advice buy only the high end Retina MBP with 16GBa and the warranty starting at $3,348 - don't bother with the slow versions - with less money then just get a regular MBP or if you want it light a macbook air - and ONLY buy the Retina MBP if you have lots of extra money or if your company will foot the bill because they replace your laptop to top of the line every year or two anyway.
The RAM requirements of over 8GB are fast going to overwhelm us and especially with HD video which will move to 4K in the next year or so. For good advice if you need a macbook pro don't buy the un-proven retina yet - buy the top of the line 15" with its antiglare screen and a 7200RPM 750GB hard drive and you can update the RAM to 16GB and to a SSD from OWC in the future to extend its life. Plus you can still watch your DVDs on the plane which you cannot do with the new Retina MBP. ( I for one will NOT buy digital disposable videos again-- a waste of money, i have gone back to DVD and BluRay, BluRay players are now everywhere and inexpensive.)
3rd piece of advice is to buy cheap windows machines for rendering 3d and video if software is available on that platform - Apple products are just too expensive to burn out so fast.

- Or buy expensive Mac Pros which I use at work for video rendering, but they have better thermal designs than the all-in-one machines.
4th: remember the Retina MBP is the first of its model - the likely-hood of lemons is high with any version 1.

Just remember back to the first intel MBP model troubles.