[M] KingFast P600 120GB Portable SSD Review
 

KingFast P600 was designed from the ground-up as a fashion element and less of a performer, which can be clearly seen from the test results. In order to keep costs low, the manufacturer did employ TLC NAND so if we start transferring large amount of files or big files to the drive and the SLC buffer fills up, we will get to see notable drops in performance. However, if we are going to use the product to move smaller files around or even install a portable OS on it, then it will operate optimally.

http://www.madshrimps.be/articles/article/1000947/