To see those, highlight and click on the Starfleet insignia at the top of the main menu. When you do that, you will gain access to all four trailers. Other than these trailers, the DVDs are virtually devoid of extras. The continuing nature of the series makes it harder to add in supplements - there'll be forty DVDs in all, and that would require a lot of content. Still, I can't help but feel something could have been added.
Recommendations are a little tough.
Volume 9 is more consistent, since both episodes are good, but Volume 10 offers the only great show of the four. Unfortunately, it's balanced by the only bad episode of the four. As with the first eight DVDs, picture and sound quality remain relatively strong, though I saw some differences in that department that favored the image of Volume 9 but preferred the sound of Volume 10. I can't heartily recommend either DVD, but I think Trek fans will likely be happy with both. The section includes full sypnosis of each episode, reviews, recommendation to the best sites, and more.