My bad JD i reacted alittle since some readers tend to overrate the story because the whole entertaining side of Dragon Masters, war with dragons. I dont disagree that it is a good story, with fresh approach. It just that Vance has written much more interesting stories with the same theme,blend of the fantastic, the rational. Many of his mature period Science fantasy novellas,short stories share that element. The Last Castle, The Miracle Workers etc
If you have read many Vance stories you see him do the same theme with different qualities. The Dragon Master, its action,adventure side is very interesting read but prose wise, character wise its clear imho to see the difference of quality in The Last Castle,The Miracle Workers. I mentioned hardcore Vance fans because we tend to agree on the best Vance shorter stories. Dragon Master has respect of quality but not great Vance science fantasy novella.
I just recommend other novellas of Vance higher, before Dragon Masters. Its good but not to buy first if you want his shorter SF,science fantasy novellas.