I've used some of the principles that Ferriss talks about in this book for the past year-and-a-half (I read them on his Web site long before his book was published, so I got this info for free) and I've lost about 90 pounds or so. I've lost about 6 inches off of my waist, and my stomach is smaller (though it still sticks out a lot more than I'd like it to, but I'm an endomorph).
When he refers to not eating "white" foods, he means starches or anything with refined sugar or flour. Eating cauliflower is fine.
Regarding the "Cheat Day", sometimes, I'll just have a cheat meal instead, but when I do "go crazy," it really doesn't affect my weight loss efforts.
Keep in mind that I exercise about 3-5 times per week, but if I overtrain, I tend to plateau.
I snack on almonds and cheese sometimes, and while I may not plateau, it can slow my weight loss down, so I try to make sure I'm full with my meals. I eat about 4x/day every 3 hours.
I have few complaints about the diet. I've learned how to use different seasonings and explore new cuisines that are condusive to the diet. It's also pretty cheap if you use frozen vegetables and canned beans (so it won't take long to cook when you are in a hurry). Lucky for me, I also LOVE Mexican food, so that helps too (I'll request a salad with beans and meat and use salsa as my "salad dressing").
Here are pictures of my accomplishments:
Before:
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"During"
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