I don't think HST has caught on to the members here. Perhaps you could be the "enlightened one" and journal a cycle and tell us your results.
Seriously, I am curious about the program. It and its theories are interesting. I am very skeptical however since the "results" the website talks about seem ridiculous. AAS-like. Any claims that border on the absurd immediately call any product/system into doubt, in my mind.
That said, I would tend to think that HST would be easier on the joints because of the reduced volume, the relative infrequency of training to failure, and the relatively higher reps/lower weights.