I recently purchased both of these products. I tried both by themselves, and both were good. The Clenbutrx is a very powerful stimulant, while theis more of a mood-lifter/anorectic. I was bored today at work and took 2 slim xtremes with 3 mL of clenbutrx, and holy crap, I was speeding. It felt great. Now I am a veteran user of all stims, legal and illicit, and let me tell you what, I would take a mixture of these 2 over almost anything. My jaw was clenched, my teeth were grinding, I was talking like crazy, and i felt freakin great, not all caffeine-ed out or shaky like when you take too much OTC crap. I mean, it felt like I took 40 mg of adderall! I don't recommend trying this, as it may be dangerous and goes against the warnings on both product labels, but I just had to get it out there that it felt freakin amazing.