Posted by a reviewer on Amazon

Iem is metal and heavy which compromise wearig comfort

Posted by a reviewer on Amazon

Also the short stem makes it fit loose and fall off easily

Posted by a reviewer on Amazon

Stock cables arent that good quality

Posted by a reviewer on Amazon

Music will cripple on volume level 75 above

Posted by a reviewer on Amazon

Anyway back to the 01s to start off these were not the pair i originally was sent the original ones i got sent were defective they were reversed in polarity that basically means the connections on the inside of the headphones were reversed this leads to a loss of stereo separation and something seems off i tested this by using the aftermarket cables i had and plugging them in reverse and they sounded just like the bl03 but slightly better in some aspectsfit way better than the 03 i didnt even need aftermarket tips for thesebuild 1010 these easily feel much more expensive than they are made of a zinc alloy called kirkzite these have a sense of weight to them and ooze qualitylows 910 deep but clear with a emphasis on sub bassmids 910easily the best part of these headphones the sound honestly reminds me of the sennheiser sound signature on my hd 599s instruments and vocals are clearly separatedimaging 810 stereo separation for instruments is decent but its not what these are for but again compared to others in the price range theyre not even closeoverall any music sounds good on these

Posted by a reviewer on Amazon

However the seller promptly replaced the iem and i got the replacement within 4 days

Posted by a reviewer on Amazon

But again 2 of the 3 pairs i ownrecieved has the problem of reversed polarityphase so id advice caution before buying these from some other website i still havent recieved the replacement for the defective bl03 i bought from the other website overallid reccomend anyone getting into audio to get these since these are a steal at this price point easily punching way above its weight class in the 10k range of audio but again your mileage may vary since in my sample size of 2 i recieved 2 units with defects so if youre fine with maybe sending the headphones back if they are defective id say go for it