Actually we do have a thread about this: The Big & Dandy 5-MeO-TMT Thread (5-MeO-TMT is the same as 5-MeO-2-TMT (the T stands for "tri" meaning there is 1 extra methyl added on to 5-MeO-DMT, which is on the 2 position. I'm gonna close this, but read through that thread and if you have questions post in there.
TIHKAL makes it sound not very good, and also not potent at all. Sounds very dissimilar from 5-MeO-DMT.