Assessment of possible fields of application:
The aircraft Do 335 could be used successfully as a destroyer on sectors without strong fighter presence. The use of as a daytime single seater fighter aircraft would be comparable to the situation of the defence of the Reich with the Me 410 in the years 43/44. Despite higher speed and strong armament of the Do 335 the use as a heavy fighter will only be successful if absolute air superiority can be achieved. Bad maneouverability and inertness of the plane, as well as bad view to the rear will lead to inevitable inferiority in dogfights.
The arrangement of the engines lead to best possible performance in a two-engined design, meaning the final stadium considering performance potential for these designs has been reached. Production setup and resolution of technical deficiencies mean that the plane can enter combat in 1/4 year at best [end of april 1945].
It has to be evaluated if the plane is still able to conduct its mission when compared to then available foreign planes.
Evaluation of the Do 335 as a night fighter (helle Nachtjagd, see Erich's explanation above) is going to be conducted at Kommando Bertram of the Insp. D. Nachtjagd.
Because of problems explained above no night flights were conducted yet, before the technical problems are resolved (esp. landing gear and compass) no night use will be possible.