No myth Vick! From 'Bombers of the Luftwaffe' by Joachim Dressel and Manfried Griehl:
The Ar 440 was an improved development of the Ar 240. The first prototype was cleared to fly in the early summer of 1942. The three following Ar 440 A-0s flew for the first time in November 1942, and in the following January they were sent to the Test Centre at Rechlin. Among other tests, comparative flight testing with the Ju 88 S, Me 410 and He 219 high-speed bombers was undertaken, and the Ar 440 showed considerable advantages in both speed and flying qualities. Further flight tests were even more convincing, so the Technische Amt issued an order for series production of the Ar 440. However, in the fighter programme of 1944 the Do 335 replaced the Ar 440, and further development was stopped...
Evan