I guess if it's a common tuning for non mids forward iems it must be good.
I listened to too many 1-2.5k bump iems and speakers, and it sounds completely unnatural to me. not 'balanced' , to the point of overall tonality of pieces and balance between instruments and or voice being fairly off and them sounding thin and treble and upper mids heavy.
also, I noticed the plug strain relief was torn out of the box on my pair. (the lowest ring is half torn)