What are your thoughts on the Tempest Sphere?

I feel very attracted to the Tempest Dynasty faction until I see the Tempest Sphere unit, and for whatever reason I dislike it. It feels like what I would put into a game when I run out of ideas.

I know I know, I haven't played with it myself yet, but it still feels 'meh'. I would have preferred being able to upgrade the main battle tank or any other unit for that matter