I tried it 1 week after I read the article in MM2000. I followed the program to a T. For 6 months straight I dieted for 2 weeks, then over fed for 2 weeks.
Result: I did get bigger, but fatter. As the weeks when by, I found it more and more difficult to loose the fat gained during the 2 week overfeeding period. The first week was fun, but by the second week I got sick of eating so much and I was taking 2 dumps a day.
So then, I changed the diet: dieting for 2 weeks, then overfeeding for only 1 week instead of 2. That worked much better. I gained a decent amount of muscle and kept most of the fat off.
One time I had an overfeeding period during a 1 week cruise... that was lots of fun!