I would expect dipole designs with dynamic drivers to have all the advantages (lack of box resonances, no side wall reflections, tons of treble reverb and envelopment) with none of the disadvantages (crazy panel resonances, no bass dynamic abilities without an 8' panel, incredibly narrow dispersion). I listened to some of the really big Acoustats a while ago and they are very impressive, no woofer, 4+4 model I think. Sounded a bit dark but I completely understand the appeal. The lack of boxiness is wonderful and an underrated issue in speakers imho.
The problem, really the only problem with dynamic dipoles is that they need active crossovers, and the demands put on the bass drivers are pretty extreme. I'm always designing a dynamic dipole with a 12" sealed sub, a 10" dipole low-mid, a 4" upper mid and two 26mm tweeters. If I can figure out an elegant way to get 8 channels of amplification into two speakon cables I'll probably build it.
The Nao and Linkwitz LX521 designs are the best known but there are a handful of other commercial offerings. The ones with PA drivers (Emerald Physics or something) and the ones with Lowthers/Full Range are not worth pursuing in my opinion. Troels Gravesen made an interesting dipole design.