...and wow. I can feel the improvement over the stock SSD (The Samsung PM951 512GB). I bought the lappy a year ago but I always felt it was not as smooth and fast as it should have been (i7, 512GB SSD, 16GB Ram, Nvidia 960M, Signature Edition). This was due to the PM951's write speeds at around 600 MB/s. Did a fresh install of Windows 10 for the Evo. The read speeds are much faster and the writing speeds are certainly blazing fast. Best of all, the machine now feels fast. Crystal Mark shows 3.2 GB/s read and 1.9 GB/s write! Even after filling the drive and installing the Samsung NVMe driver. Take that rMBP! With 1TB, now I have the space I need without having to carry around my Samsung T3 and/or WD Passport. Too bad I had to spend $477 this on an already $1900 system though (Signature Edition). The lesson here in the future is to buy the smallest capacity then upgrade to your own SSD (assuming Dell let's us do that in the future). I probably just sell the stock SSD in an enclosure on eBay to offset the cost. Oh well, I'll expense it against my side-gig income. HIGHLY recommended.