Replacing DVD with SSD - What is the best way to test SSD reliability?
I installed a Samsung 840 Pro 120GB in my Early 2011 MBP.

I have had no issues with it so far.

DriveDx is a good tool which gives health statistics on an SSD and I would also make sure you are running Trim Enabler which will prolong the SSDs life.

As said in other answer stick to big name brands and generally stay away from OCZ or Kingston as they have been reported to fail more often.