The only effect I noticed from the vanillean was a warmer body the first few times pre exercise, not really thermogenic just warmth. This effect subsided and through 2 bottles I didn't notice increased fat loss or body comp effects. The day after I bought it Cooper made a post on its under dosed and relatively ineffective ingredients, well those comments were true.
For body composition TMG at 3g has been special for me, very underrated. Note though it has been continuous use.
I take Agmatine and LCLT pre bed and my sleep is much deeper with them, leading to a greater GH release. I wake up refreshed and my body always requires a nice stretch which I have not had recently, I also feel taller after continuous use; albeit I am 23 and still probably growing. In saying that I am sure agmatine has played a role in assisting growth with the improved sleep.