Currently under development, the engine will power the upper stage of the company’s 95-foot-tall (29-meter-tall), two-stage Firefly Alpha rocket. The full vehicle will be capable of sending some 2,200 pounds (1000 kilograms) into low-Earth orbit (LEO) for about $10 million. Additionally, it will be able to send 1,300 pounds (600 kilograms) into a 310-mile (500-kilometer) Sun-synchronous orbit.
These numbers suggest to me that this rocket will be comparable to India’s PSLV. At $10 million per launch, it will beat everyone else in that rocket class. They expect to do their first test orbital launch sometime in late 2019.