1/6/2013 - Defeated the #1 player in the World in a Ranked Match.
Currently maining: Parappa
Future mains: Zeus, Issac
I bought it and I'd say it's worth the $20. Has interesting combo concepts that help give me ideas for new characters and teaches me some stuff I wouldn't know otherwise, for example Raiden can run up walls by holding X! It also says the AP cost of each characters supers which is helpful. It's not perfect as the above poster commented, but overall I'd recommend it.