I like the sound of Classic Audio speakers. They do represent a successful utilization of old school technology (field coil magnets) and modern materials and technology. But, whether they are superior to old systems or modern systems using old drivers, that, is purely a subjective call. I personally do not think they sound better than a well done implementation of old drivers. It is probably a matter of voicing; I find them to be a bit too lean and bright and brittle sounding as compared to some of the systems using old drivers that I really like. Still, the Classic Audio systems are great sounding and do outperform vintage systems in terms of bass impact and depth and ability to play loudly. I happen to prize very highly other qualities that some vintage drivers deliver--ability to sound very dynamic and lively at low volume, delivery of a really relaxed, smooth sound while remaining dynamic and clear sounding.
It is also a BIG deal to me that vintage drivers are VERY efficient. My favored amps happen to be quite low in power output.