Hey Chuck,
I've gone through several bottles of diesel test. It is definitely a legitimate supplement. It does everything that it says it will do. I just began another bottle today, but will be running it at 2-3 tabs a day, just for a general tonic...I'm already feeling slightly better after day 3.
The last time I took it, I ran it with 6-oxo and it was the best stack I've ever done. The well-being and libido enhancement were enough for me. I was taking 6-oxo at 6-8 caps at night, and 2-3 diesel tabs a day.
I think the ingredients in this product are a must for any male. Low dose for anyone other than someone who wants a tiny bit of edge for competition. Higher doses of diesel test or any other free test increasing product will negatively effect libido...
One thing you have to remember with this formulation is that its not neccessarily about the "slabs of muscle" you put on with it. It is about the mental edge, focus, and well being derived from the ingredients.