Good quality / price ratio ... provided you take into account some aspects

* Type * Memory TLC

These discs of 840 Evo series memory * TLC * and not SLC. TLC memory cells have a lifetime of 3 to 5 times shorter (1000 guaranteed write cycles per cell) than of SLC memory (3000 to 5000 cycles).

My previous Samsung SSD (although it was a SLC) had a wear rate of 9% after 4 years of intensive use, without causing any problems, so for the TLC I do not avanturerai me to use this disc more 24 months.

That said, 1000 write cycles is already a lot (see articles on types of SSD memory), it allows to benefit from a 1 TB SSD affordable for at least 1-2 years of intensive use , the time that the price of 1 TB SSD SLC as those of the 850 series down to achieve an equivalent amount.

The appellation EVO seems to me relevant to the extent that it seems to be affordable disk during a transition phase from 12 to 24 months.

* Performance Bug on cells that have not been written for more than 30 days *
(Fix available to download for firmware update).

09/10/14 I get this disc, then I clone my smallest SSD to the new disk and enlarges my scores accordingly.

Then I stumbled upon articles plubliés few weeks earlier (from 09/26/14) reporting a particularly long access time bug for data having been written more than 30 days earlier. But the fix was not released by Samsung.

Four days later, on the date announced by Samsung (15.10.14) the fix was indeed available for download on the Samsung official website, but only for Windows. By booting Windows, I see the utility of the fix requires 10% of disk space, forcing me to resize my partitions again for a Windows partition of at least 10% free space relative to the size Total disk (all partitions), then resize my partitions again to their final height once the fix applied.

In short, Samsung has responded quickly, the fix is ​​now available, and all models * 840 EVO articles (and not only marketed) after 01/10/14 will no longer have this bug, but in my case it required a lot of operations the first week after purchase.

For native Windows users however, the fix is ​​applied via a quasi-automatic wizard in about an hour for the 1 TB model.

The description of the bug is available by doing a web search with keywords:
samsung 840 evo performance bug

The fix is ​​available by doing a web search with keywords:
samsung 840 evo performance restoration software

The fix applies the new firmware EXT0CB6Q (not available in standalone at the time of writing this review) and then repackages the memory.

In short, this is still a good model transition SSD, provided think to apply the fix if your Magician Software utility indicates a previous firmware to EXT0CB6Q (published 10/15/14)