TechPowerUp posted a review on the Toshiba THNSNH 256 GB SSD
A quote from the article:
We recently tested the 512 GB version of Toshiba's latest SSD with 19 nm flash chips and a rebranded Marvell controller. Today, we are looking at the 256 GB version to investigate whether the smaller capacity reduces performance, or if it too manages to claim the performance throne.Toshiba THNSNH 256 GB SSD @ techPowerUp