i've had my LS200 for a year now, here is my short impression
Bass pretty good for a BA at this price range extends pretty well but it wont shake or rumble, you can sorta feel it at least compared to my full-size AD900X without EQ.
Mids: lower mids aren't sucked out or pushed out, male vocals come out nice and clean, upper mids are boosted but are not shouty think HD650s.
Treble: lower treble and upper treble is airy but isn't sparkly, they tuned this to be non offensive and fatiguing, it's very easy to listen too for extended periods of time even at high volumes.
cons: the only cons i can think of these is the stock cable is meh quality and very micro-phonic, the stock tips are garbage, im using the CP100 SS tips, i also have a pair of Spiral dots Version 1s in Small, missed the updated version by a month, the spiral dots have this quality about them where i can let them rest on my ears and get a full sound instead of having to jam them in like everything else, note that i also have tiny ear holes so the CP100SS aren't great for long period usage, but then again for the price point i think it's fine to get crappy accessorises but a great IEM.
Source: straight out of an LG G6 with the quad dac, no hissing that i can hear, music source doesn't matter for these, they don't make crappy mastered music sound crappy, they really have similar qualities to the senns HD650/600 but they aren't exactly them in IEM form.