They work! I have tried everything out there over the last 10-11 years or so, and have found only a few labels measure up to their word, Controlled Labs (Purple Wraath and White Flood) measures up!
I have been using MRI War as well as Scivation's X Tend for BCAA's, but now only opt for Purple Wraath!
I get Black Powder for FREE yet I STILL opt for C. Labs with their pre workout White Flood!
Bottom line, dollar for dollar, you get your moneys worth and then some!