Red triangles on DVD cases is serious business.
Really, you should avoid Manga's releases if you get irritated easily by little things. I've always hated their gaudy Manga logo, and alongside the useless/ugly BBFC age ratings that alone is enough to make me go R1, if possible on the cheap. But there are also numerous other annoyances of note, such as Manga's complete inability to align spines correctly (DtB & Claymore) and their love of releasing super cheap, nice looking box sets straight after charging more for 'singles'.
FYI, I have no ******* clue if the Blu-ray releases of Funi also get the outer box + 2x thin cases treatment. I own the DVDs, and - like all of Funi's non-space consuming releases - they look lovely.
No idea why you're buying Brotherhood, anyway. Are you going to masturbate over the sealed sets or something?