I have enjoyed owning numerous different designed speakers over the past 20+ years including MBL's for a long time which I really like.
I have found with some horn designs there are areas which they offer more similarities than differences sonic wise as mentioned above by a few in the last posts. Another area I like about my current speakers is being 107 dB so this opens up a new window of so many options of pairing up with lower powered amplification where this wasn't so with my MBL's to produce the sonic characteristics I was after.
So far I have tried a couple of low powered including SET amplification but to date prefer ARC Ref 75SE & REF6 pre combo as a whole package - so far hasn't left me missing anything where as others did. Are they the end all? no! but besides the sonic offerings neither pce produces much if any heat - nice looking to me - tubes provide lots of listening life. I just enjoy listening which in the end it's all about.