I've done it. I think it works well for novices once they have good squat form. When I did it, I squatted for a set of 20 twice a week. I did some other leg work too, but not a whole lot.
I was pretty much force feeding myself at the time, with a lot of whole milk. I got a little chubby, but it was the first time I intentionally tried to put on some weight and it worked.
At the end of it, I was squatting for 20 pretty close to my 5 rm at the start of the program. I was on it for about 8 weeks before I stopped progressing. My legs were significantly bigger and I ripped the ass out of about 5 pairs of work pants as the program progressed.
It's not magic though, and any sensible routine will add mass to your legs granted you are eating enough.