I found T4 to have a sort of nootropic effect also. A lot like T21 but without the relentless amphetamine-like push. I'd also have to agree that it smoother/better than T2, but they each have a special place in my heart lol! I will write a tr, it's been a while since I've dosed any or pulled any 2c's out of the archives for that matter - gotta love the stability of phenethylamines!