I guess you don't know about the problems with the Kingston SSDNow V300 ssd. About 6 months ago Kingston changed the brand and type of flash memory from Toshiba to Micron. The Micron flash memory is slower than the Toshiba memory. Kingston switched the flash memory to keep costs down. In addition, a corresponding firmware update (505) developed glitches. There have been several firmware updates since then. Kingston was slow to admit they changed flash memory which led to accusations of Kingston using bait and switch tactics.
To be fair I should point out that the practice of changing components is nothing new. It usually happens with low budget, entry level models. For example, PNY uses several types of flash memory in their Optima...