How do Digital Amps Mfrs. compare in sound?

HiFiCritic compared the Bel Canto e.One REF1000, the NuForce 8.5 monoblocks and the Channel Island Audio D100LGR in the September/October 2007 issue. This is a magazine that accepts no advertising in order to be able to say what they think. They were not impressed with the performance of any of the amps. They were quite powerful but the actual sound quality was lacking. As they put it," Poor treble seems a feature of Class D amplification." Some other publications have hinted at this; I remember an Absolute Sound review of 2 Class Ds where the reviewer commended on the necessity of using a tube preamp to tame the top end[ I don't have the issue in front of me]. When I posted a reference to this article previously a mighty roar was heard from owners and SELLERS of Class D amps accusing both the Magazine and myself of being in league with entrenched commercial interests. The loudest roarer was a large audio dealer. The magazine takes no advertising and while I myself am an audio dealer I do not sell electronics. You may well see this repeated here; if so, remember that those who try to stifle debate have something to hide. To me the whole thing is reminiscent of the CD debacle where a new technology was rushed to the market before it was developed.The test is not on line but the HIDICRITIC site has excerpts from a paper presented at a professional conference concerning Class D amps. I would have a long listening session with any of them before I bought one.

SONICS
"Immediately good/refreshing sound" (how Class D is commonly described... at first) can be a very superficial thing. How many times was the sound of some gear (or music) you are long term happy with NOT necessarily so good at first ?

B. NEW TEAM - SUSPICIOUS NEWBISM
"Good" (sic) Class D is a massive Analog/audio/RF/Digital engineering tangle problem, & analog engineers are sage enough to know to leave such a vipers' nest alone. Seriously clever people and the biggest corporations have all thrown "brains and bucks" at, and into Class D, since the early 1960s. Over 40 years of trying! With still very few results on the high end stage, and, very late results all round.
People playing with overly-mathemeticised plans of reality may need to write out 1000 lines :
"Digital knowledge is not power amplifier engineering." !
Not a single master of analogue power amplifier engineering has turned to Class D. Shouldn't one know this, and, ask 'Why?’
By their nature, electronic engineers are usually eager to "migrate into the future technology".

C. Because the people who make Class D amplifiers are somewhat "ignorant", let alone their advertising copy-writers, they forget that the ACTUAL efficiency of an amp has to be multiplied by the power supply's efficiency, to arrive at the nett, realistic sum. This down-plays their rather spurious/overstated claims of high efficiency, once the comparison is made on an apples/apples basis.
In other words, taking best case practical round figures, an analog amp (70% efficient) is only a tad less efficient than a Class D amplifier (90%), whether they both use a mains frequency power supply of nominally 70% efficiency (70% x 70% = 49%; 70% x 90% = 63%); Here, Class D's 63% is only "28% ahead" of 49%.
Or, if both amps use a high-frequency (switching) power supply, then 70% x 90%, and 90% x 90%, are 63% & 81%. Again, 'D' is only some "28%" better. Do you wreck high-end sound for that? But, even the average 63% (of both) is FAR more than 200% more efficient than the most efficient car or indeed, power station.
If we dare include the power station efficiency (circa 28%), then any eco benefit from just one final part of the total energy loop, acting efficiently in Class D, is further reduced!

D. To anyone with an understanding of what makes existing good high-end hi-fi amplifiers, it is hard to see WHAT Class D achieves, that is useful. No one has ever announced it or written it down. It is not a logical next step. ONLY IF manufacturing convenience, cost, and material usage were put at the head of the list, before sonic quality.
This is from Ben Duncan , prominent audio designer.