Damn this Marks and Spencer clearance Sherry..... Pedro Ximenez. The Black Bat MMCX shell is identical to the Tiandirenhe TD06 QDC shell that I have. They sound the same too. My guess will be, the Open Heart Resin Bass IEM is the same shell and the same driver as the Black Bat and the Tiandienhe. Paid £39 for the Black Bat, and the soon to be delivered, Open Heart Resin MMCX will be the exactly same shell. The Tiandirenhe sounds just as good as the Black Bat, has a good cable and is nearly half the price. It has a Big Bass, Boom, Boom. My educated guess is the Open Heart Resin MMCX will be the same. £23 is good for the Open Heart Resin and £23 the Tiandirenhe TDO6. £39.00 not so good for the Black Bat. I got the Tiandirenhe TD06 with tuning filters, and a good cable, which gives it the edge so far.
Again my guess is the Smabat NCO will be better overall.