I am doing a tst/trn at 4 mg ED of each and LOVE it, my cardio is great. I teach two Spin(group cycling) classes a week and have had no probs. I am in my second week and just started cycling in 12.5mg of atomic-h(if you have been reading NP's threads then you know why the dose is so low). Have had mild insomnia but no BP issues yet other than a mild headache but i think from dehydration as a i noticed that I am very thirsty with this stuff. I get amazing pumps, have noticed increases in strength and tons of energy once I start working out but somewhat lethargic otherwise. Only down side is my skin seems more oily than while on previous cycles but the Noxzema pads and the acne body wash are helping with the zits. Horny as hell for now, lets see how that keeps up. I am planning on upping to 6mg's next week but want to see how this week ends up. So far I love this combo.