I also think the only big drawback is getting them on axis. I built about 10 sets of speakers when Adire was first building WR/FR 4.5" drivers (now CSS) and on axis they were pretty good. In fact, of the 6 or sets of the 2-ways I built with the WR drivers, if you covered the tweeter it didn't make w hole big difference on axis, but off axis, whoa... But I think this is to be expected really... I haven't played with the Tangband FRs yet, but I have used a ton of the HIVI B3Ns, and those sounded pretty damn good also... You still may need a crossover to tame some of the reponse irregularities of these little drivers, even though you are running them wide open... Check out what Zaph does for the B3N... B3N