Thank you for your help everyone
SSD arrived, and it took me like 15 minutes to change the drives...
...because of the fact that the SSD arrived in a very strong plastic packaging that took me 13 minutes to cut open.
After I changed it I noticed another interesting thing: the HDD has 3 pins instead of 4, and they need a special keep (not pentalobe) to undo them.
So at the moment my SSD makes a clunking noise every time I turn my MBP upside down as it is not properly fixed yet, which is not a great problem as it is an SSD but I will get the proper tool shortly
using the MBP: it is really quick, and so far everything seem to work fairly quickly.
HW: nice and quick, both GPU(9400M and 9600M) works, I am about to test the 9600M as I am downloading steam
So far only test I have done was FHD youtube video. Startup is less than a minute
OS: It has parts that I like and others that are still need to get used to. I will comment about it later on after I put some hours into this machine
General usage of the laptop so far
I am going to compare it to the last laptop I used, that was an Acer V5 with much much beefier HW (i7+GT720m) but I am not going to talk about the performance
Typing is really pleasant here, my only problem is that while it is in my lap the edge of the wonderful aluminium housing is cutting into my wrist a bit.
it is not too warm, although warmer at my lap than the acer, although that is into the hardware territory, but this is acceptable
Only thing I miss is the touch screen, surprisingly useful thing!
The trackpad and the gestures needs do get used to but I love it so far, best in a laptop I have seen
Sounds is decent
As a person who is not really into laptops, I like it a lot!