My original SATA Asapter works find. I just set the boot from USB OTP bit and swapped in a CM3L. That one was purchased when they first came out. Of my two newer ones, one doesn't work at all and the otehr will work with a CM running from the on board eMMC flash, but not with an SSD attached with either the CM or the CM3L.
This is all using a 2.4A PSU.
So...dunno. It looks like something changed at some point. It's probably all moot, anyway, as WD Labs is going away and so are the WD Pi products. Pity, really..