I have one. i hate it.
It causes errors on the bus of just about anything it is connected to..sometimes. it wants just a tiny fraction more voltage than cf spec, and so freaks out in unpredictable ways (usually involving appearing to be mounted but not transferring files, yet refusing to unmount)
I had it going ok in openzaurus on my 5600, but only by doing carefully timed manual mounts, unmounting before suspend and that sort of thing.
on my 6000 it is just awful.