I have been using it as a pre for about 2 weeks. I don't mind the itchy tingly sensation it gives some. It does a fine job stimulating. I dunno if its the DMAA or what.... But this shit makes me feel not good. Like anxiety, sense of impending doom ect. I don't get that with AAS, supplements, anything. The only other thing that ever made me feel that way was the old school Xenadrine.