I love this app, and I use it on a daily basis. The dates for new dragons are done extremely quickly compared to other apps I have tried, often before I even see the new dragon on Dragonvale. There is one major short coming, though. The majority of the fun extra features that make this app so special are only available to people who choose to use Facebook. Without a Facebook account, you will not be able to post in any of the chats/forums, ask for friends, or report a certain egg is in your co-op cave. Still, it is well worth it as a place to keep your inventory and check out breeding options, you will at least be able to read the posts. An astute user will also find Game Center ID listings and be able to request a friend through that app, a ploy that has succeeded for me several times.
I would like to see them add additional inventory lists for twin dragons and pedestals, and perhaps a way to look up dragons based on breeding time.
AFFTP about Breeding Guide for DragonVale