Double Dragon Publishing is a publisher currently focused on publishing Science Fiction, Horror, Thriller/Suspense and Dark Fantasy. This includes Hard (Science) SF, Space Fiction, Future Fiction, Lost Civilizations, Utopias, Dystopias, Disaster Novels, Alternate Histories, Time Travel, Parallel Worlds, etc. They publish individual novels as well as series.
Digital publishers that have been around for 15 years are hard to find, for reasons that should be obvious. Double Dragon has been publishing e-books for that long. In 2016 they are starting to offer print versions of their books for the first time. An unusual course for a publisher, but Double Dragon has managed to establish themselves well.
Most authors seem relatively happy with the publisher. Often authors have stayed with them for a number of books and praise the editorial process. Although most authors stress that Double Dragon does not put much effort into promoting their books.
However, there has been two issues of major complaint. The first is that at least one author was not offered editing after their work was accepted. Even though Double Dragons has a reputation and a history of editing all their books. The second is that one author who contributed to an anthology has claimed that she was not paid, and that they continued to sell the anthology after the contract on it expired. You can read about both matters here.
The royalties they offer are 30-40 % of the amount received from a re-seller, and 8 % of the cover price for print books.
Learn more at their website here. If you do decide to submit to them, please be sure to follow their formatting guidelines.