It is a great looking vise.
The design speaks volumes tho.
The jaw part rides on a nice V , just like a lathe carriage.
It is a very stable way to mount something that slides, perhaps the best way there is.
It also requires grinding the V flat, and true, and the part that fits over it, just like making a lathe.
There is no way a vise requiring this much post casting machine work was going to compete with a box in a hole design....
Best of class isn't always best in market.