We took our Inspire 1 (the original version with X3 camera) for a flight at Belambi. We used the 2K video option, and D-cinelike settings and a ND filter to get the best results.
The video rate is too low for good 4k footage, 2k gives a much cleaner image. We also find that we get the best finished output by using the D-cinelike rather than D-log, and we master to HD with adjustments in Adobe Premiere to tidy the final production. The original Inspire still does very well.