Biostar announces its new series of M.2 SSDs with the M700, available in 256GB and 512GB. The M700 Series M.2 SSDs use high-speed PCIe Gen3 x4 interface and comply with the NVMe 1.3 standard, deliver... BIOSTAR Launches M700 M.2 PCIe NVMe SSDs
I guess it depends on how you look at Silicon motion as a company (SM is responsible for the controller)
256gb seems like a pointless starting point given the products from all the other companies that are already available and at pretty low prices.