I like that PANfinder has a huge database of PANs, and that it can search by name, SSN, or address to find a record. It is sometimes difficult to find the right company when searching by name, or if it has a different format from the database (e.g. "6201" instead of "6201-000-0000"). It is easy to search by SSN and find the correct company.
It is a must-have when dealing with PCI compliance. I use it to find companies that have a PAN on file with the Federal Government, and then use that…