Extremely well stabilised sound, particularly in the hi register (amps are wide-bandwidth). I've used some products (pre & phono) and listened to a full FM set-up (ie. bring yr own source, plug & play) which offered excellent sound: by this I mean, music for people -- not sound for oscilloscopes.
I suspect that channel balance is exemplary in the pre & phono equaliser (i.e. the circuit components are really matched in each component).
Their preamplification & equaliser products seem slightly superior to the amplification products -- or, otherwise said, there are other amps out there which may be competitive (in performance, not price), but very few products out there to match the pre & phono.
Price -- as per Prcinka above.