The CNT driver in the BL-05s has a lot going for it. It has high efficiency, very low THD through the whole spectrum and it sounds rich and detailed. I noticed that there are a few other IEMs that use this driver and they all are much more expensive and mostly very highly regarded. This IEM is a very good value proposition. I use it with some custom EQ and HRTF processing and don't feel the need to look for something better. I sold my Hexa and kept these. Like others said, get good fitting tips and possibly a nicer cable. The nozzles are on the short side, but the shell fits inside the cochlea nicely so they stay put.