They never finished the damn 6x6 back for the Hy6. It is the only 6x6 camera I know that cannot shoot 6x6! I have the 645 back from my Rollei days, and it works very well, but it is still 645. The Hy6 is a great body to shoot film with, but not having a full 6x6 back is a real let down. I never sold my 6008af for this very reason, so I still have that to shoot film with, but it makes for a lot of needless overlap and excess bulk -- and the batteries...man, they are a drag. So if I want to shoot film and digital at the same time, I have to bring both the Hy6 and the 6008AF, which is not exactly a petite camera. If only they had released the 6x6 back, I could have sold the 6008AF and I would happily shoot the Hy6 with film and my 54LV until someone decides to sell their AFi 10 for 10% of original retail when Phase One discontinues it.
Also annoying? They never finished the 35mm flektogon, so the widest lens is 40mm (other than a mythical 30mm fish eye that no one has ever seen in real life).