nope !! from my experience, usb to serial convertors dont work soo well. I've had my share of problems with these components. They seem to work in some cases (or even in some brands), but just refuse to work in some system (especially laptops).
So usb to serial convertors are out for me, i need the real serial port. I think the only one available from dell is a latitude e5500. But i'm trying to look for other avaiable stuff before going for it.