I used MPF concurrent with Noom for a year because I was curious how my diet on Noom looked in MPF. I lost 60 pounds (and had vast improvement in lipid panel and a1c) and have maintained that loss for more than a year. Currently, I'm only using MFP. There is a feature I wish were implemented: the user could assign 3 values of their own choice to any food (red, yellow, green; free, control, limit; hi, med, lo; whatever...). It would allow the user to see at a glance how their day was shaping up (too many red foods, generous amount of green foods, etc.). Maybe it could use existing structures within the app somehow...don't know. It would be useful and I don't think it would create proprietary issues since it would be user defined.