I got it on a deep sale and it's entertaining enough. It tends to crash though so keep that in mind if interested. I would probably be more annoyed if I payed full price or even half price but I knew the game was "rough" when I got it.
There is some new stuff to play around with. While the expanded country trees are nice the more interesting features were added in the free patch already. Still okay but maybe wait for a discount.
Some nice new Mega Structures. Slave market. And some other neat stuff like playing a MegaCorp obviously. Is it necessary? No. But it adds some more variety if you have seen everything else.
Nice DLC that adds enough for a small price. I didn't even think much about if I should get it as the price speaks for itself. If you like the game already this will add a nice extra that's far better than 5 bucks for a weapon skin in other games.
I don't regret even one cent spent on this game. The battles are fun and moderate challenging. Sometimes a lucky cockpit hit by the enemies shatters my whole confidence and breaks my formations but that's my own fault. Some minor patching would be nice but it runs well regardless.
With the 2.0 patch it was already a good reason to replay the game but this adds some fun things to play around with. Titans! Oh and space death lasers.