NOTE: This comment was made elsewhere, and I copied it to this new topic so we can discuss the general question.
What is a professional horn? It is surely one that is suitable for use by professionals which the new Sinfonico most certainly is - it has been tried out by top professionals. In fact the less expensive Dolce is used by professionals, in the Cincinnati Symphony no less for example.
The Sinfonico is also all individually handmade from sheet brass, which puts it nearer to an Adams than a production made Yamaha Neo or JP374. In other words this is a euphonium to comparable with those 3-5 times the cost. It is made in a completely different workshop to the previous Dolce - in Wessex new high-grade workshop by craftsmen which just build for Wessex to our demanding standards.
As said above manufacture has been interrupted by the Coronavirus. The Sinfonico already made are I believe all sold, so we have got to wait for production to resume to get more manufactured. Once we have a timeline, I will make an announcement.