I have. If I'm not mistaken, I believe these represented the very bottom of the line "towers" from the ESL line, and that I thought there was a large jump in performance each step of the way up to the top. Have you heard the Vantage? The jump from the Vista to that might be as big as from the Vantage to the speakers in your sig. It's been many years though. I have absolutely no idea where my filled up notebook from auditioning sessions might be, it's probably lost.
Regardless, as much as I like stats, it's hard to vouch for their "value". You get them because you have to have 'em. IMO, they do voice better than anything I've ever heard, and I've heard near 6 digit price tag Dyns and Focals, top of the heap BWs, etc. OTOH, they have many compromises too. Placement is difficult, and that's putting it mildly. You want a larger room if even thinking about them, IMHO.