At this year's CES, quite a few of the manufactuers of ultra high end, standard tweeter speaker configurations seemed to have had one thing in common..the use of the Vifa Revelator. This dome is not metal, nor an exotic ribbon, yet it is the current benchmark by these companies for their flagship models. Also silk dome tweeters from companies like Vifa and Morel are prefered by all of my audiophile buddies that design, or consult on speaker designs. Beware though! What is true today, could change tommorrow!..(10 years ago, metal domes were all the rage)