At the time of its introduction in March 1916, the type's outstanding manoeuvrability and excellent rate of climb gave it a significant advantage over fighters on both sides and was described as "the best pursuit plane of the day". It was used by many operators and entered service with every Allied power and copies were also operated by the (German Air Service). Mass-produced by several French firms, the Nieuport 17 and its derivatives were built under licence in Italy by Nieuport-Macchi and in Russia by Dux. Unlicensed copies, notably the Siemens-Schuckert D.I and the Euler D.I, were produced in Germany.