I installed the SDS in my MacBook Pro 15 "early-2011 with 8GB of Crucial RAM 1600. After installation, I did a clean install of Mac OS X Mavericks with a USB key.
In 20 seconds my computer is started, login, launched Photoshop CC.
My battery life has also been improved. I think I can make extra 30-45min on each charge.
Installation is very easy with a good tutorial to iFixit.