Back when I cared about Gundam as a whole, I tried getting in X, but the only video files I could find were shit quality, then I heard it didn't go over in Japan and as a result ended prematurely, so I just gave up on it.
Bandai released X DVDs, so there are some great fansubs out there of X now. The series ended because the market was flooded with gundam (G, then Wing, then X), and the network wanted more of a cut from ad revenue. When Bandai said hyuck foo, the network switched day and time on the series with little announcement, somethign Bandai did not like. Once the ratings dipped, Bandai was already through with Tomino-less Gundam and ordered the last ten episodes be condensed into 5. The series did wonderful on its original night and time, though.
The main premise was that the war alluded to in EVERY OTHER Gundam series went to real, and the colonies were dropped and space was fucked over, resulting in the Earth getting wasted and Space being neutered. A surviving pilot (Amuro, baiscally) forms a pirate group to survive and to find other newtypes (psychics more or less) like himself to keep them safe. Meanwhile, an asshole Gundam-jacker happens accross a gundam control stick and steals one of the newtypes, befriends her, finds THE Gundam that has a superweapon and guess what, the control stick works. Then the jacker joins not-Amuro on a quest to find other Gundams and uncover what happened during the war and prevent the surviving Space-people from enslaving the post-apocalyptic Earth.