After a couple more days, the JT-80BK sounds even smoother. The manual says change stylus at 150-200 hours. However, people on other boards say that NAG has that in all of their cartridges and is a translation error. My KAB Concorde 40 (with FG stylus) sounds great, however, compared to the JT-80, the Ortofon is more "dry" and "analytical" . Compared to my AT VM540ML, which is another fantastic sounding cartridge, the Nag is more open and "silky" in the mids and highs.