Well, I downloaded a Demo for the first time and tethered to my 5DII. It tethered immediately, it worked instantly and I found it very easy to find my way around. I liked it a lot. Much better than the old 3x version, much more modern and intuitive. I am used to working with many programs and interfaces, so I found this pretty easy at first glance. I still have to tackle the selective hue adjustments. I liked the standard colour wheel for colour corrections, easy to make changes. The Kelvin and Tint slider would benefit from an indication of what tint or temperature you are sliding towards...like green to magenta or cool to warm, but I don't really need it myself.
The only thing that I couldn't find is a button to open LiveView, presumedly because it's not supported, which is a shame if this is the case, (please let me know if this is not so).
I found it considerably better in the "noise in the dark areas" department than Lightroom.
Also, I haven't tried it beyond 100 or more pictures to see if it freezes due to the USB problem with OSX 10.5.6 and I guess this may still be an issue for the moment until Apple update the OSX.
It processed files really quickly, I was quite surprised, but I would've liked (as with Lightroom) the Output folder to automatically open and beep when the process is done, though this is no big deal.
All in all, I spent about an hour with it and was impressed so far, with many things left still to discover. I think this is a program that I may be using in the future tethered with the 5DII.