NAD, Techniques, and Marantz all make me want to try class D... but not as my main amplifier system yet.
With respect that's a rather biased statement.
You think these brands may make great products but you're not prepared to see equipment labelled with these mass-produced names in your main system. That's a shame and rather typical of many of us audiophiles.
We like to think we know best and sniff out obscure brands to add a bit of exotica and bling to our systems and we like to convince ourselves that they actually sound better. Truth often is that only these major big brands have the R&D resources to make significant improvements and can offer them in affordable packages because of their big sales numbers.
They have massive buying power and can sometimes obtain a monopoly on the latest technology. This can be included in their prestige ranges and can, if buyers keep an open mind, offer better sound quality than the best of the "boutique" brands we so much like to display on our equipment racks!
Granted many big name brands don’t bother and choose to cater solely to the big mid-fi markets, but others really do try to offer state of the art alternatives for those prepared to give them an unbiased listen.
OK, that's bound to rustle a few feathers, but I'm happy doing so and continue using products from these household-name brands in my own excellent sounding system - NAD in my own case, but I'm sure Marantz, Sony, Denon and other all too often frowned upon brands offer truly excellent sounding kit in their top-drawer ranges. Peter