I love the hell out of Gundam X. My favorite characterization in the franchise, some neat battles, and a soundtrack I really dig. The orchestrated track that plays in opening sequence explaining the background of After War sticks with me.
On the flip side, a couple of the primary antagonists are awful - bizzarely out of place considering the effort put into everyone else - and the mecha design is... hit or miss. The Gundam X is one of my favorite designs ever (I could gush!) and Bertigo is the best Qubeley period, taking the original design and melding in a boss pigeon motiff. Virsago and Ashtaron are too blunt, feeling more like super-robots, and some of the others, probably Airmaster the most, feel like designs picked up from the cutting room from the past series of the time.