So far I've only taken two classes in Egyptian Arabic and it's awesome ! I am so happy to finally be learning a new language.
What I really like is that the interface is great, but the content is actually quite good too ! I love the fact that the person teaching you through the audios is super nice and very encouraging. The pace (beginner) is very good because it lets you understand each word and then put them together. Most of all : it explains the roots of certain words and describe how the language actually works... So far I'm just loving it.