Marc, as far as I know, the PSU unit shown in Vegas was an advanced prototype, not a full production unit... PSU has not been released. I have not heard of any price yet.
What I have heard about PSU is that it is a power supply based on supercapacitors instead of NiMH batteries. At least in theory, it should be capable of delivering quite a bit of authority, because supercaps are capable of very quick power surges, while NiMH batteries are not. But, until I hear the effect of PSU on a device myself, I will have no idea of what it really does for living in general, nor whether it lets Corus surpass Criterion in particular. G.