I took your lead and perused the same horn on Ebay and wouldn't you know it, Quinn had a great price. Got mine for $598 plus shipping.
I have an Ammoon(Slade), which might be at the level or beneath the Eastar you're upgrading from and I too am a Hobbyist. I explored this topic a few months ago and ended up with an early Weltklang soprano and I didn't like it at all. Apparently, the one I bought was manufactured just before B & S took over and made better horns.
This price point and the feedback in this thread has me excited about it. Antigua sops were recommended to me back then, but I found the German horn and threw caution to the wind. My cheap Ammoon can live in my locker at work and my new arrival can stay safely home. I hope it works out for me, but it's definitely an upgrade at a great price.