Yeah, I heard some months ago that Kingston changed the NAND in V300. This is shitty, I liked Kingston because their drives are reliable. OK, maybe the newer series still also reliable but the shown speeds are not bad, it´s awful.
But still wonder about the read speeds, the older series like 200+ also used asynchronous NAND, but the read speeds were ok, only the write speeds suffered.
But atm in Germany the cheapest 240GB-SSD is Crucial M500, didn´t recommend a more expensive Kingston or Samsung