I have the 13" base and originally had the Toshiba SSD and LG display, but I exchanged because it had dark patches at the bottom of the screen. The replacement model i got has the Samsung SSD and display.
I can't tell any difference with the SSD, but i did feel that the screen was noticeably nicer from the moment i turned it on.
Now that my screen is perfect and i'm also happy that i've got the double samsung combo, i now have a creaky/clicky macbook air. My previous MBA did make a slight click/creak when moved, but not as much and as loud as this one. I don't want to return it because i'm afraid that a replacement i get would be defective in some other way and i want to keep the double samsung combo. So i've ordered the 5 point petalobe screwdriver from iFixit and will loosen the screws and reseat the bottom cover.