-Great lenses for awesome prices
-Interlocks work very well (the ones on my RB ProS didn't work)
-Locking rotating back (my RB back would drift between portrait and landscape)
-Accurate, reliable shutter
-One cocking motion (as opposed to 3 with my RB)
I can see why so many people love the RB, but I can't see why so many seem to have a prejudice against the RZ. The battery just controls the electronic (accurate) shutter, but otherwise, it's still the same mechanical camera.