The Omega speakers are a wonderful balance between size, simplicity of cabinet, cost, quality, and the advantages of extended range Fostex drivers. They are an extension of where Fostex lives, in a higher efficiency, lower cost, and highly musical world.
Most speakers aimed at the SET crowd push efficiency so hard that colorations are created. And most push horn designs that can sound very "forward" and become very large. Klipsch is a prime example of all this, but so is every Lowther based speaker I've heard. Not that those are bad speakers, in fact Klipsch are typically marketed in solid state stores, where they match up very poorly and Lowthers are really an extended midrange driver forced into reaching too wide a frequency range.
Fostex drivers tend to sound better on tube amps, chip amps, or digital amps. The Norh SE-9, Cayin TA-30, Channel Island Audio monoblocks, a host of small digital amps, or a variety of the inexpensive digital receivers are all good candidates to drive Omega speakers at reasonable prices.