If you're looking at this I'm sure you've already seen the rave reviews for this series elsewhere, so I'll briefly add my two cents that this is indeed the single best science fiction series ever, animated or otherwise.
Volume 2 (don't forget to buy volume 2 as well) concludes the series with the same perfection you are soon to experience in this first half of the series. By the time the series ends, "Eureka seveN", unlike so many other series, not only answers every question you may have had and delivers several "Holy crap!" surprises, it actually has a very good, very satisfying ending.
I'm a very nit-picky person when it comes to my entertainment, but other than breathing at high altitudes and at tremendous speeds without some kind of air mask and and never changing their clothes despite several scenes where the female cast go shopping, there is not one scene, not one word of dialogue, which I can complain about. "Eureka seveN" is not only a fantastic and original science fiction story, it is impeccably well told from start to finish. Like "Cowboy Bebop", it's the kind of showpiece you can lend to your animé hating friends to show them than animé has come a long way since "Robotech" and "Captain Harlock" that they watched on TV when they were little.
Nice menus, good quality video and audio, and the English voice acting is as good as the original Japanese cast (yes it is, purists -- accept it) and I'd go so far as to say it's better because having Renton (the main character) voiced by a boy instead of a woman sounds a lot more convincing. Subtitle options include the now standard (for the most part) of well translated full subtitles or translations for Japanese words that appear in scenes only. Also, the opening and ending songs include both English translations and romaji for those who enjoy singing along.
My only disappointment is that the audio wasn't remastered into surround sound, but otherwise this collection is proof that Bandai finally "gets it" and has stopped buying properties to just dump cheap English dubs on us.
The extra's are a bit dry and the limited number of trailers for other series is disappointing as is having the first two openings and endings appearing textless only once each, but it's a far cry from Bandai's past standard of not giving us any extras at all.
All of the commentary (one episode per disc) is "hosted" by the Japanese voice actors for Renton and Eureka with one or two of the other cast members as "guests", and with few exceptions this is rather like listening to a bunch of friends getting together and talking as they rarely bother to comment on the show itself. The sole exception is when the director "guests" and gives insights into some of the symbolism, much to the surprise of the ditsy hosts who clearly thought that this was just another dumb animated series. You'll lose track of the number of times they say with shock and surprise "...and this aired at 7am on Sunday morning!" every time a serious scene comes on.
The cast interviews (again, one per disc) with the English and Japanese voice cast is hit or miss (mostly miss) but that's the case with most DVDs; however, I would have preferred interviews with the people responsible for the actual production of this series like the directors and writers as I'd love to hear more about the symbolism, etc., but again, it's better than the nothing Bandai usually gives us.
In conclusion, don't hesitate to buy this series, and specifically, this two volume set of the complete series of "Eureka seveN" as this is no cheap bootleg or half-assed production: This is a good quality product.