Frankly, Isochronism, I wasn't that enthusiastic about the look of the cartridge, specially with a Lapis ball in front. I still am not but I am looking beyond that as it is the sound that I am looking(hearing)at. After 3 days of playing, putting in about 12 hours of playtime, the sound is getting better with better imaging and more air around instruments. The good thing about this cartidge is that it never sounded harsh or edgy even when new. Bass seemed to extend deeper than the 1st day and the top frequency has more shimmer and air. The whole frequancy range is well extended with good timbral accuracy. Vocals sounded very lifelike. I will give another comment when it reach the 50 hours mark.