i've idled away several afternoons at his shop and have always been impressed with the quartet; i still own and use a smaller van l monitor from the mid 90s. i haven't heard a simultaneous a/b of the quartets with others, but i've heard enough of 'em to opine that they're on a par with the psb synchrony and paradigm signature s2 (two of my faves)--all share the same qualities of seamless driver integration and big soundstage. keep in mind that the quartets aren't really full-range--they propably extend down to 50hz or so--and depending on your tastes might use a sub.
