Well, just finished playing a few rounds on the new maps. I like them a lot. Vekta looks amazing especially when you can see out the damaged hull and the train is what Tharsis should have been from the beginning. It will take some time to get to know the maps, but I have a feeling that they will be among my favourites.
With that said, DO NOT BUY THIS DLC! GG can't seem to get it through their heads that they need more information on their server lists. For some reason I can now filter searches by the "Original KZ2" maps, or any single map, or "Any" map. But I can't search by games that have the new maps in rotation, nor can I determine if the new maps are in rotation without first joining the server. This issue was an annoyance when I was just struggling to see if FF was enabled, or faction balancing, or weapons and badges. But now, having paid money for additional content, I am already frustrated at the prospect of having to jump in and out of games when all I wan't to do is play on a server and get to the DLC maps once in a while.
Speak with your wallet people. At least this is better than Resistance, but no where near as good as Warhawk. Why can't people learn from the success of others?
Now, obviously if my concerns are not your concerns then buy the DLC as you still have Bots and the maps are good.