Lots of DSM owners have installed the PMS. In fact, there are so many people using the PMS that the it has its own mailing list ategroups. There also exists two page on PMS tuning: here and here.
The manufacturer, EFI Systems, apparantly provides good support for the PMS. Unlike the AFC, PMS owners rarely plead for installation instructions.
It is in the nature of the PMS that it takes time to fully understand how to tune with it. Most PMS owners are willing to share their experience to save others from the same mistakes.
The Last Word: The PMS is a fairly primitive tuning system with only three RPM points. Do yourself a favour and get a DSMlink (available for 1G and 2G) or at least an AFC.