I bought this expecting to be disappointed it wasn't what I was looking for, but it turned out to be EXACTLY what I had been shopping around for offline (to no avail, of course).
I am FTM, I'll put that on the table now; I'll be living with a host family abroad soon, so I was looking for something that I could wear around the house that'll still flatten my chest a bit because I can't be binding with the 997 at all times. Currently, I've been wearing a spandex camisole under a cotton one with a flimsy, built-in bra, and you want to know something funny? This microfiber compression tank both compresses better yet allows me to breathe better. Isn't that crazy?! I think it's because the built-in bra's hemline was digging into my ribs.
I've been wearing it for the past two days, and, as opposed to my aforementioned old undergarments, it feels like it's not even there sometimes. I love that. Before, if I were to lift up my sweater then let go, the material would probably cling to my chest, and I would have to pull it back down myself. Now? If I were to lift my sweater then drop it, it'd slip back down. Also, the sweater hangs from me now. HANGS. It doesn't cling to my figure because of the undergarments that weren't actually compressing me but just adding onto my fat. This probably has nothing to do with this thing, but I'm just so happy be without clunky layers for the first time since, like, elementary school lol (I'm 21).
Anyways, this thing's awesome. To anyone wondering if they should get it, here's some info: it feels like the material on a woman's bathing suit albeit thinner but somehow stronger. My chest measured 40 inches, which would make me a large, but I got a medium, and it's perfect. My chest is only a teeny bit noticeable, but it's better than what I was wearing before. I'm a B-cup, I think, and a little above average weight, so even a cisman would have the little bit of chest it gives me.