Hermaphrodites: Advantages & Disadvantages

Advantages:

1. You don't need to find a mate different to their sex. Thus, spend less energy looking for a mate.
2. Ability to self fertilise
3. Barely run the risk of becoming extinct.

Disadvantages:

1. More energy is needed to maintain both reproductive systems
2. Limited gene diversity
3. More likely to have less viable offspring if the organism self fertilises
4. eliminates competion for a mate allowing defected and less suitable organisms to pass on their genes.

http://mattc-thinks.blogspot.com.au/2011/06/learning-from-snails.html