Pretty good ending but I think it could have been handled better, especially with how little development the Von Braun voyage ended up getting. Aside from that, this manga is definitely one of my favourites. It has its misses on occasion, but the character development and story progression were really well done. I only wish there was more of it since there wasn't much room for Hachimaki to grow as a character, especially with his romantic interest in Tanabe.
I started reading this manga after I started watching the anime, and I find it funny that all the major gripes I have with the anime aren't even present in the manga. Granted, there were some anime-only episodes I liked such as the one with El Tanika, but I can't comprehend why Sunrise decided to spend more money to make a worse adaptation.