The location of the food truck is ok. It's in the BTC City that has limited option of vegan food (if you don't count salad bars in the surrounding restaurants). So this is good.
The opening hours are terrible. If you want to get dinner at 19 o'clock it's closed (the opening hours written on HappyCows' web page are incorrect).
I went there with my boyfriend and tried Falafel, Vebaba (in a jufka) and apple Samosa for a desert.
I found the falafel a bit to "crunchy", but otherwise ok.
The Vebab was good, but a bit to small (if you are really hungry it wont be enough).
For a dessert we got apple Samosa (a kind of healthy full grain apple pie) that was really tasty and fresh (they made it on the spot), but the problem was that it was still cold inside.
Cons: opening hours, portions are on the small side, cold food (Samosa)