An honest Amazon review who talks about the hiss: https://www.amazon.com/gp/customer-reviews/R3UDU7GX0TJCM2
Last a few days, I listen classical music with some silence parts from Tidal HiFi. Hiss is barely audible in the silence parts for me.
To everybody who can't hear the hiss: Could you guys please listen this: https://tidal.com/track/38163567 and play pause to hear difference in the sound? If you still can't hear it, then this should be something with the personal hearing sensitivity. (If you don't have a Tidal account, Tidal HiFi has a free trial period. )
BTW, I fully respect who say "the hiss is there, but the amount is not a big deal" as this is completely a personal preference. But this shouldn't be in the way of denying its existence. Please don't forget that "Stephan F" reported B&O Germany says the hiss is inevitable and that it is cause by the "bluetooth connection".