first of all amazing earbud with insane battery backup and 5 hr playback by earbud is great. They also come with adjustable eartips and earfin so adjust it to your comfortable way so that you can hear the best sound. Also these earbud is very loud and heavy bass without any EQ but applying EQ gives balanced sound with more clarity but you might lose some loudness but more clear and heavy bass become punchy but lose thumpy bass which is fine for me cuz it felt a bit muddy bass without EQ. Overall a little adjust makes this earbud from good to great.
CONS: you can't add two device at once unfortunately. Also if you are not used to earfin it might cause you pain after one hour of use (happening to me a lot) :(