Hardware.Info tests lifespan of Samsung SSD 840 250GB TLC SSD
 

With an average lifespan of 75 years for the TLC memory chips, consumers have absolutely nothing to worry about. It doesn't mean the SSD will actually last 75 years, but the number of available write cycles will not be the bottleneck. That means we will amend our conclusion from a couple months ago. A Samsung 840 SSD with TLC memory is just as reliable as SSDs with MLC memory, and the type of memory should not be a reason to choose one SSD over another.

http://uk.hardware.info/reviews/4178...date-20-6-2013