There seems to be a good bit of discussion about the tweeter height. In my mind, it's not that the tweeter needs to be exactly at your ear height, but it isn't significantly over your seated ear height. Think about a great imaging pair of mini monitors, you would never put them on stands so the tweeter was as high as some other large speakers - the tweeter would always be around your ear height. Same thing goes here - I have heard the Arrakis back to back with other Rockprt speakers in the same room at the same time, and the Arrakis is just as specific as the smaller, less complex designs. Just as specific in terms of focus, but quieter, more resolved - simply better and more dynamic and full range. Whenever I have listened to other manufacturers simpler designs versus their larger one - the smaller, simpler ones will always out focus the bigger ones. If you listen carefully, and are not swayed by the price or dynamics, I have found that you always pay a price. In my experience, the Arrakis is the only super speaker that can equal the minis in focusing powers, and have all the advantage of being bigger. I think a part of it is that the tweeter is closer to ear height (along with serious attention being paid to cabinet diffraction via the large, sweepingcurved baffles - something you cannot do if you build a cabinet out of any type of sheet stock). To me, that is what makes it totally unique - you pay no penalty for the extension and dynamics.
It never made any sense to me to have a tweeter 2 feet above your listening height, forcing you to "look up" to the soundstage. As I mentioned earlier, no one would ever put a mini monitor that high and expect it to be better - so why in a big speaker? Just my experience, of course.