That said, when asking for impressions like this, I think that you need to consider confirmation bias. I thought about it for several years before building these speakers, including hours spent going over the information on the Linkwitz web site. I then spent several thousand dollars for speaker parts, crossover, amplifiers and cabling, in addition to hours building. Anyone with that experience has a pretty strong predilection to like the results.
There is probably some truth to this, but I think there are pretty clear pros and cons to open baffle speakers as well.
The biggest Pro (IMHO) is the very open and airy sound stage. The speakers disappear much more readily than box speakers and the sound appears to be emanating from the entire space behind the speakers. The drivers are unencumbered from back pressure, and from back-wave reflections, which tends to allow them to operate more linearly.
Another potential advantage in many rooms is that they have reduced interaction with side walls since the front and back wave has some (potentially a lot) of cancellation to the sides, which can allow them to work better in rooms where box speakers might work poorly.
The biggest Con is that they need to be placed further out into the room. In my experience, the sound stage benefits greatly from having the speakers further into the room. I have mine positioned with the front baffle 7 1/2 ft from the front wall. Danny states that the minimum distance from the front wall is 3ft. To be honest, I haven't tried them that close. I started at about five feet and found that they got better as I pulled them out farther. I think this is somewhat dependent on the wall surface though. Much of my front wall is glass, which I've treated with drapes and four 2'x4' GIK diffusor panels standing on the floor behind the speakers.
Some people don't like the "wall of sound" that dipole speakers create. This sometimes can make it seem like instruments or voices are bigger than reality. I've found this to be very dependent on the recording. Most of the music I listen to sounds quite natural, but I could see how some listeners would prefer a more intimate sound stage.
I've been an audiophile for about 45 years and have owned a lot of different speaker systems. My current NX-Oticas are the first dynamic driver OB speakers I've owned, but I've owned a number of different Magneplanar speakers, as well as numerous conventional box speakers. I always loved the huge sound stage and lack of boxy colorations that the Magneplanars provided, but they lacked the dynamics and deep bass that I enjoyed from my dynamic speakers. For many years, I went back and forth between Maggies and dynamic box speakers because after a few years, I missed what the other offered.
The NX-Oticas and OB servo subs are the first speaker system I've owned that really delivers on all fronts.
I am fortunate to have a large, dedicated room for my 2-channel system (27' x 17' x 8'). It's not perfect, but with the acoustic treatments I've installed, it's the best room I've had for audio, and the OB speakers work wonderfully. There are going to be rooms where it's just not practical to dedicate the space for a full range, open baffle design.
The X-Statik speakers that you are considering is a hybrid design which is sealed box for the lowest frequencies and open baffle for mid-bass and up. I haven't heard these speakers personally, but I expect that this would allow them to be placed closer to the front wall without compromising or bass response as much.
