The translation quality is rather poor, and although it does seem to improve, it doesn't seem to ever reach a high level. Those who aren't native English speakers don't seem to get as annoyed about stuff like this so it may be sufficient for many, but if you're someone who needs a good level of translation quality to really enjoy a manga, like me, then this series probably isn't for you. Maybe the quality gets better once you reach the chapters done by Asura, but from the brief skim reading I did of one of their chapters it seems that even their translation has at least some errors.