It is 645 Full Frame,
Robust design, Great software
It had never hang up in operation, unlike my other Digital Germany Cameras
Sensor plus, Live view (not your Cmos live view) but its better than nothing, as its more easy compare to ground glass disoriented framing, I use it only when it is absolutely impossible to frame,

sensor plus is not as good a quality as advertised (in my own opinion)
ISO 50 is gorgeous, ISO 200 is not so pleasing to me, after all it should now be used on high ISO,

I had used 5 digital backs in the past,
CFV16MP ver.
H3DII-31, H4D-40,
P45+,
S2 (but not really a DB),
compare all of them, CFV hang up regularly, H is reliable, P45+ and IQ is the best, S2 not a DB but its nice,
IQ is really ground breaking to me,
If you have used DB before, and compare it with older backs,
you will agree with me that it is the best DB in the market so far,
I will upgrade to 645 FF CMOS if they relase it or if I can afford it