I didn't mean a metal case, more like an aluminum frame/buttons with glas back/front... Like a top tier smartphone. 8-10 hours is enough most times, but with battery degradation I rather have a bit extra LED: I really like that the BTR3's LED changes color depending on the BT codec USB C is a no brainer for any devices released this year and beyond, another micro USB B would be laughable. Wireless charghing: I didn't think much about wireless charghing until i tried it myself, its so convenient, also with most flagships of 2019 will feature reverse wireless charging, which could be a life saver on long trips for stuff like BT dac/smart watches/ BT headphones. I wouldn't mind to pay a bit extra for all these features considering Radsones awesome track record with everything from SQ to firmware updates. I'm also thinking about an improved ambient mode, like todays BT headphones, but obviously it will be much harder since the mics wont be outside of both ears.