I bought a Ruby Z from Kron. Fast shippin and responsive. However,
the serial# was changed on the outer white paper that wraps the case. I reached out to Benz. Apparently, my carts serial # doesn't exist to them. They called it a grey market cartridge. No warranty will be honored as far as they're concerned. The cartridge seems fine but what did I buy; who knows? I wouldn't do it again.