good print, and no ink marks on rest of page from spillages, which occurs with copycat cartridges. the only problem with original brother cartridges is they are so much more expensive, but on the positive side they produce a professional finish.
This appears to be a genuine Brother part but in a different box. At £74 including postage it saves up to £45 on listed prices of Brother-boxed items. I've been using it now for about three weeks and it seems fine. The only thing missing from the usual Brother packaging is the return envelope for the old cartridge.