The UX might be good but I've heard nothing but complaints about the app quality from teenagers and that's on iOS. They are starting to straddle snap and Instagram.
It's great for sharing photos and quick texts but no one uses snap maps, the sponsored content is cringe, and I have yet to see spectacles in real life because unsurprisingly, we don't have the money to buy $100+ camera glasses.
I should also add that a lot of my friends do use Instagram stories, but a lot of the time it's just a picture with the text "AMOS: {sc_username}" (AMOS means "add me on Snapchat") so take from that what you will.