I had a pair of LSA1 Statements for a time. They use an Aurum Cantus ribbon tweeter, I believe. The highs were sweet and airy, very nice!
One of the raps on ribbon tweeters, in the past, has been that they are difficult to integrate seamlessly with a cone mid-woofer -- two different technologies, etc. But I have to say that while the LSA's weren't ultimately my "forever" speakers, I never heard any glaring discontinuities between drivers. I liked them quite a bit.