I warmly recommend this novel. It is very refreshing and original.
Translation Quality:
Overall, I have been satisfied by the language quality. English is fine.
However, assessing this particular aspect is always hard since I don't understand Chinese and i'm not a professional translator (Translation is a very peculiar exercice and requires dedication). English is not my mother tongue either.
Update Stability:
The team has usually kept the daily schedule. Moreover, the author has not published much more chapters so there is no point in expecting a quicker pace for the updates.
Story development:
The novel is one of a kind on this website. By any means, it is a Xanxia novel. Yet, the writer gives a mysterious, otherworldly mood to his story and to the characters. For once, we feel that pursuing immortality is a journey for the protagonist, that he becomes something different than the "common folk" ("similar" to the Selbstüberwindung from Nietzche perhaps).
Character Design:
Very satisfied. The focus is on Jing Jiu but the other characters are given enough attention to feel real. Relationships and backgrounds are rich.
World Building:
The world feels coherent and real: a well done typical Xanxia (Martial Sects, etc.) with a complex background, which is being developed along the story (Nothing has been dumped violently).
Furthermore, the story has not fallen in this unpleasant cliché: this continent is a small backward island, there are skies beyond skies, etc.