It depends on where you are in your hifi/audiophile “journey” as to whether you would put the AHB-2 on your list.
Many of the resident AHB owners here are of an age where they want an end game, 100% reliable, quality built amplifier of superlative performance that doesn’t cost telephone numbers and isn’t the size of a bar fridge which will likely ‘see them out’.
For tech adopters who still are under the false illusion that everything gets better, they can’t see past the sea of class ds vying for their attention. Thing is, they’ll be upgrading for a while, so overall longevity isn’t an issue (to them).
The price is cheap for what it is.
This. Very much this. I haven't received mine yet, but the reason I ordered one is because I want an amplifier that I will use the next decade or two or three (or should I decide to sell it, I won't lose much money on). Regardless of what speaker I throw at it. So even if I should upgrade to Focal Utopias, I hope the AHB2 will extract all that's possible out of them.
Also, versus a NAD C298 the AHB2 isn't that much more expensive (given that you can get discounts on the AHB2). Yeah, you could save some more with a DIY kit, but I hope it's obvious why that's hardly comparable.
Basically, I'm too cheap to get something other than the AHB2, where I might spend again soon enough and where I'd lose a lot of money when I try to sell what I bought in the first place. And I am fortunate enough to be able to buy it.
Oh, and, that C298? A friend has one that is noisy as ... I mean, you can hear it sitting maybe 2-3 meters away. The actual device, happily humming along. It was sent back to the dealer, and they were like... "So...?". Can't remember if it went to NAD as well, but in any case, he did not get it fixed or swapped.
Another thing that led me towards the AHB2 is the protection systems. I have managed to clip my Kantas with a Powernode and hope that there's no permanent damage. I don't want that to ever happen again. That alone is worth quite some money to me, because damaging the speakers would be even more expensive.
Finally (perhaps): In Germany the list price is 4500 €, which is a bit insane. However you might be able to get a better price when talking to a dealer... what you rarely see is a good price on the internet.