I find the best thing about them is the coherency - that's where they have a big edge on Wilson, Magico, etc. They also have an "aliveness" that some other sealed box speakers lack. The big negative is they really need 400 watts into 4 ohms to snap.
Currently run Hailey 2.2s with Music First preamp and Ampzilla monos. These amps are not embarrassed by more expensive ones.