I can't do the tetras except for emergencies (if i am delayed out.. i keep a few in the boot of the car) because there is so little of them. I prefer the choc and vanilla shakes made up to 600mls with coffee in them - have a pint mug and it's yummy, gets more water in me and takes ages to drink
I absolutely LOVE the tetras and the strawberry is my absolute favourite. I've also tried the choc one warmed up and it is lovely. Feels very decadent when you're drinking it. As everyone said though, just make sure you keep up your water intake. Good luck.