I have stubborn, straight, downwards-pointing Asian lashes. After curling them, I apply mascara and they just immediately drop down again. This mascara doesn't give me that issue - they stay up perfectlyyyy.
When the tube is full, sometimes it can be a bit tough to make sure you don't have too much product on the wand, but when you get it right, my god it looks amazing. It does dry down fast, and I don't really recommend going in for a second coat since I find that I'll go from having beautiful wispy lashes to a spidery thick clumpy look.
I have oily lids and I've experienced zero smudging, and I haven't had any flaking issues either. This mascara is like, industrial strength though - you'll need a good oil cleanser or something to get it off (I use the ilso sebum melting one, which does the job but I need to be a bit patient with it - ymmv).
I got the color Long Ash because I thought it would be a bit more natural-looking than a jet black, but it's a bit too light for my dark lashes - so if you're dark haired like me, keep that in mind.