Spoiler
It think its a cool story thats different from the movie adaptation (Apprantly the Doan episode was really popular in Japan, hence it's many adaptations). Doan's comrads are a bit more fleshed out in the manga than the movie (though in the case of Hjal Mar not any more likeable, thankfully so far it's just him), though Hjal Mar's behaviour shows exactly why Doan deserted. Plus like the previous Oono series Missing link it's a OYW side story focusing on rather neat designs and variantions, many of which are updates from MSV.
(yes , I know there is an older post on this, but it''s eight years old and we can't comment on a thread more than two years after it's last post, plus an offical relase may spike more interest, especially as there's still a lot of Gundam Manga that isn't relased internationally.)