I've owned this on dvd since it was first released in America several years ago, and it's still one of my favourite animé.
If you're looking for a sci-fi series where the spacecraft fly like fighter jets, then this isn't for you. This is "real-science" fiction. All the science you see is either being developed (like fusion reactors) or are being examined for practical applications.
Just to let you know, death and danger is one of the main themes that runs throughout this series. Explosions, terrorist plots even cancer - an ever present factor when you have no natural protection from solar radiation. But there is a lot of humour, friendship and even love.
While the hardware would seem to be the main emphasis, it's the characters and their interactions that really makes this a superb watch. My wife doesn't normally watch sci-fi (well she does, but grudgingly...) but she enjoys this one. No imperial battleships, no aliens or alien invasion. Just a fantastic set of stories that are woven together.
There are some interesting facts about this series, covered in a Japanese extra that wasn't released with the US release.
1: The space station design data is based on actual JASA information: The diameter and spin required to generate a gravitational effect, the size of the solar panels required, oxygen use, etc.
2: Momentum and inertial forces are accurate for all the spacecraft, etc.
3: Kessler syndrome was proposed by ex-NASA Orbital Debris Section head, Donald J. Kessler. Latest reports show that Kessler syndrome is close to actually happening.
Finally, I'd just like to say "buy this." It's a lot cheaper than when I bought it, and it is a brilliant series. While you're at it, try to get the manga. That has a few more fantastical instances, but is otherwise still a good read.