I wanted to improve the performance of my brand new iMac with a supplementary SSD
Everything was very smooth and I didn't have any problem. I confirm that the dust is your worst enemy when you put back the glass screen. I took me 45 minutes, I thought it would be many hours but surprinsigly no!
THIS IS HUGE, I advise everybody that can afford an extra SSD to buy this kit and to install it yourself in the mac.