I have had quite a few cartridges over the years, mostly very good moving coils, without getting into proper high end ones, until I purchased the one I have now, a Koetsu Urushi Vermillion, which I can only describe as wonderful. Despite this, it has not been plain sailing all the way, my arm isn't really heavy enough for it, but I love the arm too, a 12 inch unipivot Analog Instruments Siggwan, made from a continuous length of cocobolo wood. So I have has to accept I am not getting all that is in the cartridge, although recent experiments have shown that adding weight at the headshell & counterweight , does bring an improvement, so I will continue to try different weights to try & find the sweet spot. As an aside I have been thinking about treating the arm with the same lacquer as is on the cartridge. Many people say that one of the reasons Koetsu's improve as they age is due to the lacquer hardening over time, making the rosewood that the body is made from become more dense. I have no idea if anyone has ever had the same thought, but it seems a legitimate thought process so I will see how it goes.
To try & take some of the day to day mileage from the Urushi I have fairly recently purchased two vintage Clearaudio mn carts, a Delta & a Pradikat. Both have been rebuilt with the correct cantilever & stylus tip, & I have to say I am very impressed by both of them, different to the Urushi of course but I could live with them forever if I had to for sure.