I love the dialogues. They help you develop your listening and speaking skills rocket fast. Unlike the Pilmsleur approach that I have also used, Rocket languages also has the reinforcement activities where you get additional listening, speaking and writing practice so you learn to spell correctly and pay attention to accent marks and special characters.
I am giving it a 4 out of 5 because in my opinion the price is pretty steep (I can get the Pilmsleur CDs for Portuguese level 1 for $34 in ebay) and I feel for that price it should also include some grammar videos with activities and reading comprehension to make it more well rounded.