I think it's a revelation simply for finally making use of the back of the controller, there's been all that unused space since controllers were a thing and they're finally putting it to use. Shame there's only two buttons but that's still a win!
Additionally, the two-stage triggers, that's a brilliant feature. The X52 HOTAS has a two-stage (digital) trigger and it's super handy for Elite Dangerous, moving something like aim down sight/fire, accelerate/boost or guard/attack to a single trigger frees up more buttons. Maybe there aren't a whole load of applications for it yet but it opens up some options for keyboard > controller rebinding.
Which reminds me... This controller may never really 'stick'; multi-platform games (the ones that are more likely to be played on a pad, really) will still have to be designed around the Xbox One controller because it doesn't have as many inputs as a DS4 or Steam controller, so the Steam controller's extra buttons will go to waste there... But I don't care, I'd love a controller that enables me to play point and click games from the sofa and this will do that.
I wonder if we'll be able to map the rear buttons to work as shift buttons or mode selectors; you could feasibly use a pad for all of Elite's controls if you could double or triple all the inputs.