Got them long time ago, initially got very dissapointed because they sounded dull, kinda "canned", and lacked extension on both ends from my cheap DAC/amp (Hifime Sabre 9018). I was used to a bright bassy sound, coming from ATH-M50x. After lying around in a drawer for a few months, and me getting used to a much more balanced sound (HD6XX), I decided to give them a second try listening from my smartphone. For my surprise, those things surprised me in a great way with, and now I use them as my daily night buds.
They're super flat, very light and tiny, you barely notice you wear them. You can lie on your side in bed/couch without major issues (I've owned 20-30 IEMs, those are the smallest, and the only ones with whom I can lie on my side). I discovered they sound dull when plugged to higher output impedance amps (like my Sabre 9018 or laptop's headphone out) due to their impedance curve, but when using low impedance sources (smartphone, for instance) they sound really well balanced and have decent extension, a nice natural and relaxed sound. They're great for watching series/movies because mids are very well presented, so dialogs are crystal clear, not like some V-shaped headphones that sound great with EDM/hip-hop music but voices sound distant and artificial.
Overall, they're good, worth the money (if you know what you're buying and you have a proper source for them). On the negative side, the included foam tips are complete trash and even removing them can be troublesome, I suggest buying some Comply (T-100 are supposed to fit well) or use silicone tips (seal with silicone can be challenging due to their shape, YMMV).