Price, looks, width, weight, durability.
None, unless weight is an issue at this price point.
These bars are a great option for someone who rides XC but can't afford to go carbon. They are wide and have a few different options for rise and sweep. When I installed these bars the wide stance gave a feeling of much greater control and responsiveness. These bars are very durable and have withstood a few crashes without any signs of wear or bending. I did eventually bend them, only slightly but I think my broken collar bone speaks to the fact that the bending was not unwarranted!