Im using the Aurum Cantus G1 ribbon tweeter, and I'll say this, there products are very good. I wouldn't hesitate to try any of there tweeters.
I do have a attenuator circuit for my tweeters, which I have used a lot. and one of my ribbons blew shortly after i got it, replaced it, its been running a long time now, 2 years without any issues.. First set of ribbons i have ever owned. Just a wonderful sound.