The Apogee Diva, when it was new, was the best sounding ribbon speaker of all time. It was a maintenance disaster.
Magneplanar wins the award for the best overall ribbon tweeter.
Ribbon speakers make no sense when there are amazing ESLs out there. They can be designed to be full range line sources and not just a segment of the range which is terrible in regards to imaging. They can be designed as full range drivers or from 100 Hz on up to 24 kHz.