I did it this year.
I lost 19 kilos in 10 weeks.
i found it very easy after the first day or so. no headaches, but then I had gradually cut back on caffeince before I started, and would highly recommend this if you are planning to start TF.
Similarly, the chromium tablets ( not necessarily the TF brand) are really worth it, regardless of which weightloss program you are on. they help prevent sugar cravings by balancing your blood sugar levels.
TF is very had to come back on to once you stop though (or at least that was my experience).

Also you have to really watch your fibre itake. I could not get mine high enough, even with the supplements, which is why I had to stop the diet - it gave me haemmorroids