(9/20/18: New life given.)
The Mikoyan-Gurevich DIS was a twin-engine heavy fighter. Originally powered by a pair of supercharged AM-37 inline engines, the project in it's entirety was a failure as the AM-37 was horribly unreliable. Here, it is outfitted with a pair of the more reliable AM-38 inline engines.
Entering service mid July 1942, pilots reported the aircraft as a ideal firing platform, fast, maneuverable, and a fast climber, especially against German medium/heavy bombers. The only cons was that it was overweight and the control struggled to respond, esp. at a high altitude.
Experiments were tried with 37mm NS-37 and 45mm NS-45 cannons in a gunpod, but it was not put into service because they were needed for Ilyushin's Il-2M-Type 3M ground attacker, the LaGG-3-IT, and the Yak-9K heavy fighter respectively, but there were cases of ground crews field modifying them in the field at the request of their pilots.
Although it can hold itself against the early Bf-109Gs and the Fw-190A-4s, starting with the G-6 and the A-5, it was vulnerable to them. It was later pulled back to second-line duties such as recon, harassment bombing, and liaison at the end of the war.