Lodestone actually has a pretty good page for PotD.
http://na.finalfantasyxiv.com/lodest...e/deepdungeon/

It's a quick way to gain experience and a relatively easy way to get ilvl 230/255 weapons.

It's certainly a good place to start.

If you enter as a job that is under 50 you get exp and gil for each complete level set you clear (you progress 10 levels at a time.) If you are above 50 but below 60 you get exp, tomestones of poetics and money. If you are level 60 you get Poetics, Lore and Scripture.