I was on Ideal Protein 2 years ago and lost 50 lbs. I averaged 2-3 lbs/week. I recently started lchf and at the end of my first week (yesterday), I had lost 6 lbs. That's more than my first couple of weeks on Ideal Protein. I am finding lchf to be much easier and less expensive to follow. I am also feeling much better physically than on Ideal Protein.
I think Ideal Protein is a good program, especially for someone who just wants to eat what they are told and have it handy in a package and lose weight fast. Like you, I like the lchf for its emphasis on whole foods. So far, my weight loss has been better on lchf that Ideal Protein, but time will tell.
Hope that helps!