Have you considered including: the audio signal output frequency range (20 to 20 kHz at 8 ohms), standard minimum speaker load specs (2 ohms or 4 ohms?), distortion (max. ?% THD), the input tube type, the number of double-die lateral mos-fet output transformers, for the DVA 850 in the Audio Circuits section of the web page? The Absolute Sound review states the input tubes are 12AT7.
https://avahifi.com/collections/hybrid-power-amplifiers/products/dva-850-mono-block-amplifierThe FET Valve amplifier web pages continue to state that they represent "our highest expression of hybrid design" which may conflict with "Our very best amp, the high power mono block DVA 850." Some revision of the text may help to clarify these statements.
The Synergy 450 amplifier web page states: "The Synergy 450 is our most powerful solid state amplifier" which may conflict with those of the DVA 4/2 and DVA 700 amplifiers.
You may want to revise the text on the AVA Upgrades web page, since many of the old products can no longer be upgraded to the latest designs, to not give an incorrect impression. For example, the text could refer to the below four available preamp and power amp upgrades, since older DACs can't be upgraded.