I haven't tried this style of bars, but I'd like to give them a try.
I'm a fan of 'crazy bars' that are sort of a similar idea. They're slightly swept flat bars with bullhorn 'hoods'. The design provides many options for adjusting posture to fit different situations of surface/climbing/descending etc. And they often can fit standard flat bar controls, and some even can fit dropbar controls on the bullhorns as well.
VeloOrange made the first version (and a new updated version), but Koga also makes a similar style (called 'Denham') that has been ergonomically tuned for touring. You can also fashion a similar setup with bolt-on bar ends (sometimes called inner bar ends) on almost any wide flat bars. SQlabs makes these ergo ones (https://sqlab-usa.com/collections/innerbarends), but there's lots of cheaper options too.
This article covers the design details of the Koga Denham bars in the context of all-road touring: https://www.cyclingabout.com/koga-denham-bars/