I read Hofmekler's book and tried the diet several months ago.
The book was definitely a mixed bag...there seemed to be some "folk wisdom" underlying the diet, and some intriguing hypotheses. But there didn't appear to be any serious science.
Nevertheless, I was curious enough to try it. The thought of being able to gorge without getting fat was an irresistable notion.
As a maintenance diet, it seemed to work well enough...I maintained my bodyweight and felt fine. In fact, I seemed to feel an improvement in my mood and sense of alertness during the "fasting" portion of the day, in the first couple of weeks of the diet. But it's difficult to evaluate this type of response--let alone measure it.
In reading the book, I got the impression that Hofmekler had experience making the diet work as a way to stay lean, but not as a way to gain muscle mass efficiently.
Although the diet seemed to work, it didn't work for me quite the way Hofmekler said it would. He said you could eat as much as you wanted until your thirst overpowered your desire to eat. Didn't work that way for me. I still had to pay attention to calories, or I could have gotten fat.
For me, the bottom line was that it didn't feel like a healthy way to diet on a longterm basis. All that mass and energy dumped into my body in one feeding, day after day
I also worried about stretching my stomach, or even messing around with insulin sensitivity.
I'd rather do it on an occasional basis.
Bryan Haycock mentioned research which indicates something like the Warrior diet may work for muscle gain:
http://www.thinkmuscle.com/articles/haycock/protein-pulse-feeding.htm
I guess we'll have be the experimenters and the experimentees.
However, since I've had difficulty gaining significant muscle mass, I'm going to go with what's worked most often...until the science shows a better way.