I had a 500GB HDD in my Macbook Pro and since I use my Macbook to produce EDMusic I started to run out of space and had serious performance issues in the end.
I bought the 1TB SSD HD from ifixit.com with the repair toolkit and cloned the OSX with all my files to it via USB over night. Next morning I replaced the HDD following the instructions in the ifixit videos and bingo, I have a superb fast Macbook and working perfectly with no issues at all. Thx Ifixit!
The small round magnet inside the SSD case sometimes got out of it when mounting the HDD. I got it set in again after fighting a little bit. I think that metallic magnet should be totally enclosed within the rubber case. imho of course.