No experience with the Yamaha, but I did look it up.
I'm using a couple of these in my Hauptwerk set-up. I'd imagine they'd be quite similar to the Yamaha you mention. They work well and are also reasonably priced, they do go on sale occasionally for around $100.
https://www.bestbuy.com/site/insignia-2 ... Id=4156007
For higher end without the normally crazy high end price I've looked at Amps from Emotiva and have heard good reports on them, some here I understand are using them. Given I generally do not run the volume at a very high level (trying to save my hearing for many years of Hauptwerk to come! ) I do wonder how much better things would sound.
Marc