I've never bothered with any of the DT products. Like Coop pointed out, they are mostly test mimetics with a few vasodilators...which is NOT a bad thing per se, they just can't be said to actually raise T levels. I certainly use many of the ingredients when I want to boost my libido and they work great. I do think some of the mimetics like icariin can mimic test well enough to actually increase protein synthesis. I definitely put on mass while using big doses of Drive, but ultimately that could have been from the forskohlin, which does boost test.
I had taken Maca enough times prior to the release and subsequent popularity of these products to recognize that the rave reviews were all about...being extra horny and angry, grrrr! lol