The SSD speed of this new rMBP is certainly impressive BUT in real life, most of you will not notice any significant difference between this SSD and the one on a 2012 rMBP for example.
The huge difference in speed can only be observed in HDD intensive tasks like video editing.
The other thing I want to talk about is the Radeon card in the new iteration of rMBP: I feel that this is a really bad choice for such expensive machine.
I have very bad experience with Radeon cards since they appeared for PC desktops because 2 out of 3 of my Radeon cards for PC died but luckily for me, they were under warranty.
Unfortunately I can't say the same thing about my old Early 2011 MBP whose Radeon 6750M card decided to die after three years but a few months before the replacement program.
So, for me Radeon cards either desktop or mobile are BIG NO, NO, NO, NO's!
This leads me to another topic: the Iris PRO graphics!
After I repaired and sold my old 2011 MBP, I've bought the Late 2013 15" rMBP with Core i7 at 2.0 Ghz and Iris PRO graphics.
I was and still am stunned by the graphics performance of the Iris PRO which is the same or better than the performance of the GT 650m from NVidia!
In Bootcamp I play GTA V at 1440x900 at normal/medium settings at minimum 30 fps, average 35 fps and maximum 50 fps! Battlefield 3 performs even better: I get minimum 35 fps, average 45 fps and maximum 60 fps at 1440x900 at medium/high settings!
Of course with AA or MSAA disabled in both games.
For an integrated graphics card, this is HUGE!
Here are some benchmarks of it:
http://us.hardware.info/reviews/4776/intel-iris-pro-5200-graphics-review-the-end-of-mid-range-gpus
I have a friend with a 2012, non-retina MBP with an NVidia 650M 1GB and the performance is identical or a bit lower than the Iris PRO! It's really unbelievable..
If you count the increased battery life, low operating temperatures and the missing "which graphics card is running now?" fuss, the Iris PRO MBP is a clear winner!
Now, one can really understand why Apple chose not to include a dedicated graphics card in the standard 15" rMBP. It's a great decision!
Anyway, if you're more than a casual gamer or you need workstation class graphics for video editing and such, I have a serious tip for you:
External GPU (eGPU) which works over Thunderbolt

!
I recommend for such setup a non-dedicated GPU MBP (Iris PRO only), MBA or Mac Mini but with a Quad Core Core i7 and Thunderbolt 2 (20Gbps) because the MBP's that have a dedicated GPU cannot use the eGPU to display content on the integrated display so you'll be forced to use an external display.
The setup costs between 250$ and 450$ + the GPU card itself.
Here are some examples with Macbook Pro's or Air's (most are the 13" model) running with PC desktop graphics cards that
achieve 90% of the performance of a PC Gaming Desktop.
THIS IS A GAME CHANGER FOR MACS!
Take a look here:
https://youtu.be/h_wAxRs0YAE
And here:
https://www.youtube.com/watch?v=TvcChAeli7Y
And here:
https://www.youtube.com/watch?v=kZZdwkICE3M
Or here:
https://www.youtube.com/watch?v=Cs5WcDEAGtM
Here's a tutorial/story on how to make your own eGPU setup for your MBP/Air/Mac Mini:
http://linustechtips.com/main/topic...setup-guide-benchmarks-egpu-setup-windows-81/
Conclusion:
1. Iris PRO > the same or better than the dedicated GPU NVidia GT650m 1GB.
2. Macbook PRO with Iris PRO only > Great configuration, awesome for casual gaming, great battery life, much lower temperatures and no risks of failed dedicated GPU's.
3. Macbook PRO with Iris PRO only + eGPU > Extremely Powerful Gaming Station

!
It must be something to use an
NVidia GeForce GTX TITAN Z with a MacBook PRO on Yosemite like this dude here

(Octane Render and Cinema C4D benchmarks included):
https://youtu.be/cPOB9qmPjaE
