Steven Stone has posted a review of the Spatial M3 Turbo S loudspeakers ($1995-$2595/pair) at HomeTheaterReview. His conclusions:
“While there are a number of conventional loudspeakers with limited dispersion patterns, only horn-loaded designs can have a fully controlled dispersion pattern like the M3. However, most horn designs (especially older ones) are large arrays that require a good deal of space around them. Some horn loudspeakers are so large that they can only work in a fairly large room, but the M3s can be used in a modestly sized room because of their unique design characteristics.”
You can read the full review here.