I bought a bottle back in August just to give it a try. I find myself using it more and more lately.
School work is starting to take its toll, and my workouts started getting shitty: just not present mentally or physically.
But lately with Spike every workout is great. I get home, Surge, shower, and I seriously feel like going back to the gym.
No shakes though...
And I don't recommend taking it at night, unless you're prepared to be up until 5 a.m. (as is the case with me).