The SSD Plus is an entry-level SSD that uses MLC NAND in the US. It’s primary design point is affordability, and the NAND inside it are probably the ones not graded high enough to use in Sandisk’s flagship SSDs. Like many other types of products, there could easily be variation depending on locality. At least in regards to the US product, it is an outstanding budget drive.
http://www.anandtech.com/show/8827/sandisk-announces-entrylevel-ssd-plus-ultra-ii-msata
