I am currently using slin sane, but im only 2 weeks into and cant give a solid review yet, but i feel more energy when working out, and i also take one before bed and feel leaner, so i think so far so good. Ive never used tcf-1 but i love alpha t-2, erase and titanium, and cant beat the stack price....also sleep really good on the powerfull, i just dose at nite and not preworkout, tried a few times and didnt noticea difference so im just doing 2-3 caps before bed 5-6 nites a week, def stretch the bottle out