Another thing to consider... If you are doing any programming for some of the older software packages, many of them will only accept a certain limited number of com ports(1-4, or sometimes 1-2)... The usb adaptors may or may not automatically assign a com port in this range, depending on your computer's setup. I've just been picking up a small docking station/port replicator for our laptops that don't have serial ports, and it ends up being a lot easier in the long run(but more expensive).