I have no idea how 'excellent' it was.
The fuel injection seems to be (by listings in books) a single nozzle into the eye of the supercharger. A number of engines were using similar by the end of WWII.
The engine was too small to be a major player.
It was 18.3 liters and was good for 860hp at 3,000rpm for take-off using 100/130 fuel and 9.25lbs of boost.
It was de-rated for helicopter use. At least in a 1956 book.
It was about 200lbs heavier than the G-R 14M (1200lbs). I don't know why, so speculating, it was for reliability/durability? In the 1950s people expecting much longer engine life than was common in the 1930s.
It was certainly smaller in diameter but it was heavier and made less power than a Bristol Mercury that was running on 87 octane fuel.