A very charming show with strong dual leads in Maisa and Camila Queiroz. Though the show may appear to be "nostalgia bait," it has strong, emotional storylines about family, adolescence and what it is to be your own person. There's the usual romantic plots that are melodramatic, but its teenagers and it never feels overly convoluted. The six episode seasons are snappy, though it occasionally feels too fast in regards to secondary character stories. Coming at this from someone unfamiliar with Brazilian pop culture, in 2006 or now, there are certainly references I miss but it is enjoyable to find new music or shows.
If you want something with heavy sci-fi or a strong understanding of how the time travel works, this is not the show for you. Or at least manage your expectations. This show utilizes it's time well, has good performances from all the cast, a compelling plot, and great music. Though the English dub isn't bad, I highly recommend the original Portuguese track with subtitles. Perfect show to binge over a weekend.