Haven't heard those speakers, but I've heard several speakers with the same drivers in similar configurations with well executed crossovers. I'm comfortably saying I have a very good idea of how these would sound. Differences would be minimal. I can't imagine the Signatures competing here. My Studio's are nowhere close as good as the Seas drivers in Tyler Acoustic's speakers. That guy's got a nice little setup going there.

The transmission line design I'm working on will either use the Millenium or Excel drivers or something comparable from Vifa or Scan-speak. I like Seas drivers though. Their quality is 2nd to none. Problem with Seas is their premium drivers aren't much better (or any better in some cases) than their aluminum line, just easier to work with. Not sure if the extra cost is worth it.