My experience with Black Mountain dulcimers is that they are good instruments. They are not fancy, but are well built, play well, and sound good. Back in the 1970s and 80s I considered them an excellent entry level instrument which could become a lifetime instrument. Whether or not it is an upgrade from your current dulcimer you will have to determine from playing it. They have a very comfortable VSL and in my opinion make very nice chording dulcimers.

Ken

"The dulcimer sings a sweet song."

You should consider taking your current instrument to the shop and playing both side by side. The important thing is which one suits your ear better.

I am exploring options locally to upgrade my current dulcimer. A shop locally has one from Black Mountain for sale. They look nice but could not find anything about them searching the forums (could be user error on my part). 

https://blackmtninstruments.com/about/

many thanks