Ekinci O, Abitagaoglu S, Turan G, Sivrikaya Z, Bosna G, Ozgultekin A. Saudi Med J. 2015 Apr;36(4):432-6
Randomised group of 80 patients split into i-gel and ProSeal groups, with insertion time, gastric tube insertion and complications among the results measured. Insertion was easier and quicker with i-gel.
Link to abstract