And that is where the Main Six, plus Spike and the Cutie Mark Crusaders, come in. They belonged to the group of Beta Testers. Of course there were many familiar faces as well. Big Mac, Thunderlane, Sunburst, students from Twilight’s school, Dragon Lord Ember, even Sunset was invited over. All so they could have the best feedback from many different sources with their own unique viewpoints.

When you say students from Twilight's school, do you mean the young 6? And Thorax and starlight? You did mention Ember and Sunburst.

Huge writing gripe here. If someone is joining a conversation and they haven't been mentioned yet, mention who is talking before you start the quote. Having someone talking before you know who they are should only be used for surprise or suspense. Not the beginning lines of a prologue. Having speech start and not knowing who to attribute it to is confusing.