I'm reading the english adaptation being published so I'm only up to volume 4.
I'll say that I love the artwork (and I think the anime adapted it decently) and the storyline is satisfyingly more detailed than the anime adaptation of it.
Its just the damned stupid choice for an english title "is so embarrassing".
((can't say I'll miss Sinclair in the manga.... though having him in the anime let Karin's friend blossom more))