Hydroxycut is a thermogenic, so it raises your bodies resting temperature, which raises your metabolism, which causes you to burn more fat.
ECA's also are mild diuretics, so they draw subcutaneous water (this water is between the skin and muscle, and makes you appear fatter becuase it decreases definition)out of your body.
So, ECA's create a two effects that make you appear leaner. They actually make you lose more bodyfat, and cause you to lose excess water which will make you appear to have more fat.
Additionally, ECA and creatine make a great combination, especially if you are already relatively lean (13% or less).
I wouldn't recommend buying Muscle-Tech products as i do not support their maketing techniques, their products are overhyped and very overpriced.
You can get the same results cheaper, basically.
My ECA of choice is AST's Dymetadrine Xtreme.
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I'm The Man.
[This message has been edited by SirCackerot (edited 04-21-2001).]