The factory seat leaves a lot to be desired in my opinion, even though I found it comfortable. It's too big and bulky and gets in the way when you climb ( I like to be able to actually see the teeth gripping the tree)and the factory seat blocks you from being able to do this when it's folded up. I replaced mine with a homemade seat that I fashioned out of an old fishing net after seeing a picture of the Hazmore seat. It is comfortable, light and sets you several inches higher than the factory seat.
Take care,
Jason