Throwback
No, I don't own one, though I would like to. ;)
I've only heard the MC1B many times and I do really like it. Really think it is a very fine cartridge that extracts all there is between the grooves and let's you hear it without pretence.
I once had the opportunity to listen to MC1B and the Urushi through my Herron phono stage. All I can say is that at this level, these carts sound very similar, only slight biases towards warmth with the Urushi. Hard to go wrong with either.
Do let us know how you like the cart once its run-in.