How is Sandisk X400 m.2's?

Are they full m.2 speed or SATA III speed? They seem to be coming out decently priced. Anyone got one yet? I've been happy so far with my 500GB Ultra II from Sandisk but that's the only drive in my PC time to add a little more.

Here are the specs for the X400s :
https://www.sandisk.com/business/computing/x400 (Scroll down a little for the specs)
Its SATA3 speed.