This M8 is the newest model and worth the money because you can use the new 16-pin cartridges, which is more effective for me than the 36-pin. Previously I used the 36 pin with the older model A6 (which lasted only 1 year before conking out - reason for buying another). Customer service with this vendor, New Life USA, was great and resolved an issue with a defective Nano cartridge. Would order from this vendor again.