There's a big thread about the Daige on this forum a few years ago. As mentioned I recall there's some good tips from a guy who coats his canvases this way.
In the video, the presenter says the back of the print does not get coated, I don't see how that would be the case but that would remove my biggest reservation about the product.
Would not want to leave any of the coating products I now use for very long in that tray for fear of developing skins and gunk. Would also want to empty the tray though a standard paint filter. OTOH, if a print did emerge with gunk, it would not be too hard to simply pick it off and recoat right then, I suppose.