For various tours including Halong Bay I have only seen one traveller recommend them on this forum, however, I have not seen a critical one. We are considering using them this fall, but thus far have been able to find out very little about them or their history. Their website doesn't show their history nor have I seen them mentioned in any prominent guide books. We would welcome all comments from anyone who has used them or knows who they are. The one review was very positive. Thank you.