Is somebody a member of Prince Club International (PCI), a frequent stay program of "Prince Hotels", a Japanese hotel group?

Prince Hotels don't provide FSP to Japanese residents, but I happened to find they provide one for others here.

Special members' rates, late checkout and room upgrades are explained as member benefits among others.

I want to know if the "special members' rates" are good. For example, regular non-member rates at Tokyo Prince Hotel are like this. Will members be given better rates than this?