I will certainly try it out when things get back to near normal maybe Autumn or next year. I love flying but also love train travel. With so many years of neglect of the Greek railway systems this is a big deal. Nothing of course compared to Germany and France but then of course you cant compare the two.
The ability to sit in comfort in new interiors with a restaurant and wifi is something that will appeal to many business professionals. The ATH-SKG route has thrived due to the lack of proper railway infrastructure. This is about to change. Add that to other projects in both Athens and Thessaloniki with Metro.