I've never done intermittent fasting. Before cbl, I did carb nite, also by keifer and that gave me insane results. The thing is, I couldn't stay it on while doing anything sports related that demanded a lot out of me, so I switched over to cbl. I feel like people are going to get annoyed (if they aren't already) when people like me respond to a thread and give a quick summary of their experience with a diet and then say 'go read the material', but really that's what folks need to do. Read carb nite and cbl and you'll understand the science behind why they work. I can't sit here and type out whats already been documented by a physicist because you're too lazy to go read it.
Keifer also takes the time on his website to explain why cbl is intermittent fasting evolved. Read that too. I like both carb nite and cbl because keifer's extensive studies into the science behind them proves that they work. And then when I tried them, they actually, almost counter-intuitively worked.
If you are already pretty lean and you are eating oatmeal or granola first thing in the morning, these diets will take you to the next level. Pros: both diets leave you really satisfied, incredibly shredded and you have a ton of energy all the time. Cons: non so far.