Place whatever value on this you like but I also had a Samsung 840 500GB SSD fail just last week that was almost exactly three years old. It came with a three year warranty so I guess that's the only upside.
It's maddening that not only can I not get back whatever data wasn't backed up (thankfully not much) but I have no way of wiping it before returning it under warranty.
The people who handle the returns for Samsung say returned drives will be "formatted". Given it's uunresponsive, this seems unlikely
It puzzles me why drive manufacturers don't offer data recovery for their own products as a value add service. Nobody could get the data off this drive as cheaply as Samsung themselves.