By Delock still there a cheaper Serial Adpater as Express Card (66211), but this seems to me a USB serial adapter to be and this one (66217) a real serial port, so I'm happy for this decision.
This works at least a PBX (more untested) where the USB-to-serial adapter have failed so far, therefore a postive review.
Incidentally, even if not listed at Delock, with me it also works on Windows. 7