I did TF for about 8 weeks, I lost 10kg & then got a BFP so had to stop. But I do plan on going back on it when I finish feeding Pie, like you I really need the kick-start, I am hoplessly unmotivated otherwise.
Long-term, I think I will probably keep using some of it, their shakes are quite nice & suit me very well for an easy breakfast or lunch, one of my biggest problems is quick healthy stuff & no time especially in the morning. But a shake, I can do, you know?