Used it a couple of times since it launched as a pre W.O. and during PCT. I think I may have logged it somewhere here as well.
Mixed pretty well but the pink lemonade flavor is what sold me on it.
The inclusion of the BCAA's into the mix helped things along in the gym, especially after a long day a work.
In comparison with the two DAA products I've used, I liked Formula-X over FinaFlex Pure Test due to it being drinkable pink lemonade with the added goodness and not more pills. On the other hand, I do prefer iForce's Intimidate over all the other's due to the deep night's rest I get when using it.