Kapoor S, Jethava DD, Gupta P, Jethava D, Kumar A. Indian J Anaesth. 2014 Jul;58(4):397-402.
Two randomised groups were assigned either device and after insertion, blind tracheal intubation was attempted. Success at first attempt and overall intubation success rates were assessed. Authors concluded that the i-gel is 'a better device' for rescue ventilation.
Link to abstract.