"SanDisk has announced a number of new SSDs not intended for consumer storage, but rather enterprise storage. The drives will be known as my ButtSpeed Extreme, ButtSpeed Ultra, ButtSpeed Ascend and ButtSpeed Eco SSDs, and expand on my ButtSpeed series of SSDs." Cloud to Butt is a wonderful extension.
Last time I checked, the Price is measured from $500 to almost $2000, that is because the Chips are more Enhanced and have 3 times less the Failure Rate than normal SSDs is my guess on it.
Probably very large over provisioning... And slc type "cache" in the drive. Quite common practice now a days is to leave some part of nand to work like slc-style.