I had one clutch maternally incubated last year and I plan on doing it again this year! 5 eggs laid and 5 eggs hatched perfectly.

Biggest Pros: Inexpensive. Don't have to buy an incubator or build one yourself. Sure they aren't that expensive, but FREE is also very nice.
Easy. Just let mama do her thing!

Biggest Con: My female wouldn't eat while she was on her eggs...therefore she probably didn't gain as quickly or as much weight for the upcoming season.