Perfect for the Pentax 645Z.
In my review of the Pentax 645Z:
In general, the Pentax designers did an outstanding job; your author picked up the camera and was using it within 5 minutes without even cracking the manual. Things like mirror lockup are better done than any other camera, period. But to see the CARD NOT FORMATTED bug still present a year after I first saw it with the Pentax K3 is disappointing; it’s a general bug afflicting both.