I did it for some time, sometimes eating virtually nothing through the day (which is not what Hofmekler actually recommends). It did assist with keeping lean but, IMO, it reinforces negative eating patterns if you already have such tendencies. In other words, if you are prone to binge eating then you will regard this diet as licence to do so. Hofmekler, like so many other authors trying to sell a diet, condones this up to a point. Likewise, instinctive eating does not work for many folks, especially if you are trying to adhere to a consistent calorie deficit. I disagree with Hofmekler strongly on that one. My last 'negative' observation is that I believe it can lead to cortisol issues over the longer term. I made good progress but got to that stage where I thought it was working against me in terms of stubborn fat, fatigue, etc.
I still do IF but think I have a greater handle on it through more structured eating with attention to timing, macros and kcal intake. I credit Hofmekler for introducing me to IF and have huge respect for him (which prompted me to purchase a few of his books) but I couldn't personally go back to his version of the diet.