Yes nursebean, it really is. I only started this WOL Aug18 and have already got to a level I never achieved on 5 years of Weight Watchers. The last time I was lower was 1999 when I was training for a 10K. (Not running now because of an injury 3 years ago)
In my 20's I had success on WW and got to the upper 130's which I maintained to my early 40's when I quit smoking and went into early menopause. 30 lbs. of fat arrived on my body seemingly overnight, followed by another 20 lb. over the next 10 years. I am now in my early 60's and despaired I would ever lose this weight. Believe me I have tried. Hundreds (thousands?) of dollars to WW, and dozens of diet books later I think I may have found the solution...5:2.
This has been the most do-able plan I have ever tried and I truly think I can maintain this for life.
I don't think I'll likely see the 130's again but hopefully the 140's. My goal is to be out of the overweight BMI range (<25).
I agree with Julieathome that you have to pay attention - be mindful on non-fast days and have whatever you want, just not as much as you want. I am tracking all calories and activity every day using a fitness band (the Jawbone Up band) and find it invaluable to keep me on track.
Keep going everyone and good luck

I'm a believer!