Yes I have friends with Kondo-one a Neiro and the other an Ongaku.Absolutely agree. I still have my Kondo Japan pre and power amps. Beautifully made and they sound great -- but the DarTZeel is better sounding in every way. Every way.
The Neiro is just not very good-just not a balanced sound with an emphasised midrange and very rolled off treble.The Ongaku is very good but the owner has never been able to find the right speaker match and is still hunting after 15 years!
I have not directly compared the Dartzeel and the Neiro but feel sure it would sound much better on his Avantegarde horns.I have compared my Bakoon amp and the Neiro and in my opinion that was far better-great actually .But the Bakoons do not have the bass authority of the Dartzeel .