He's never ate a whole one yet, but the task of opening it, is one he devotes himself too religiously. It keeps him occupied for quite some time.
I'll find a half eaten, thoroughly chewed banana by the time I get home.
Nothing he really likes, ever hits the bottom of the cage. He places such things on items in his cage to keep them close at hand.
His Clanger Banger is often used for storage.
I usually do cut the bananas in wheels, but sometimes I'll give him a whole one just for fun.