Another review with an additional group of measurements came out for the Adante bookshelf, and while they subjectively reviewed well for bass quality, the tweeter subjective and performance measurements provide a good insight to how they were engineered.
As the tweeter begins to cross over with its mid diver, a flare at around 10 degrees off axial occurs ranging form the upper mid range to mid treble. This levels off at around 30 degrees with the axial response and then the typical upper treble roll off that occurs with most tweeters. There is a mild notch at the upper end of the mid treble as well, which may be attributed to that oddly designed cover.
Considering its designer, this is certainly an intentional voicing and my expectation was to create a broad and vivid sound. You would likely need some very specific positioning to get these speakers to work. Very little toe in would be a good start and maybe some room dampening.
If you test these for yourself, certainly bring your most favored recordings, but I would also bring some less than ideally mastered stuff to see if you can enjoy all of your library with it. A speaker that doesn't allow you to enjoy your library isn't something I would purchase for myself.