I'm 100% with Birds on this.
I spend 60 hours in a gym with some extremely strong and hard training individuals, and some ordinary ones.
The really good ones, use Jacked or Craze the MORNING OF THE COMP only, NEVER for training, so 3-6 x a year
The ordinary ones use it every session, their reasons are very similar to Troy's
I have a PT in my gym, trains his own clients here, all the guys take these drinks, none of these guys are as strong as my girls, none, I'm dead serious
Making sure you are prepared to train hard every session is just a part of it
If you rely on stimulants, you'll fail because it means youve not done everything right
Just an observation from where I sit