I have actually heard D'Agostino gear in person a couple years ago, it is quite good. It also has that cool Captain Nemo look that I really like. That said, I own ARC Ref gear. It did not make me want to change. But I doubt I would be happy with any solidstate gear long term.
You can learn nothing by listening to gear on Youtube. It is hard enough making judgments while listening to gear at a dealer. The only way to truly compare is at home in your system.