Has anyone used the Hifiman TWS 600?


Hi 
I saw the HIFIMAN TWS 600 advertised on Audiogon and decided to order them for $79 on sale from $199.  They sound absolutely awful!. Very narrow, tinny sound.  There is a note in the box that says they need to 10-20 hours to break-in for them to sound their best. I have run them for about 4 hours so far. I can't bear listening to them so have them running off a laptop in my office. 

Has anyone experienced the same?  Does the sound dramatically improve after 10 hours ?
Thank you 

djperez1959

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