We have a customer in Tanzania with a PTP 650 link delivering 284 Mbps to a remote area 143 km away. The link is used to provide Internet access to resort communities as well as video surveillance to protect conservation areas from poachers.
See the full case study here.
I'm sure someone out there has a longer link with either the PTP 500, PTP 600 or PTP 650. Post your most amazing link here. We would love to hear about it!