Just because of this thread, I have been checking out clips of HC. It looked so much like what I do with Bob Harper's workouts, that I had to know.... so I ordered Volume 1 the other day.
I just finished it. It's tough, but not over the top. I think Vol 1 must be the easiest of the group, is that right? I can't tell from the clips.
Those of you who like these types of workouts would really like Bob Harper's workouts. Many of the moves are the same. I've been doing his workouts for a while now, so I figure that's why I'm able to do HC Vol 1 fairly easily. In particular, his "Totally Ripped Core" and "Total Body Transformation" are excellent and the most similar to HC.
Now I am thinking I might need the other HC workouts!