Code3cowboy maybe for your application the serial works well, but for me the best one is the USB KPG-36 cable. Not going to retype my reasons, since all can read in above post. I don't have have any problems programming my two TK-290 or one TK-280 with this cable. I don't feel the serial cables are bad, but just have to find a USB to serial converter cable that works well with it. Wasn't able to do that here, so starting using the USB cable with no regrets. One the record I also use a USB programming cable on my TK-780.