I haven't tried any off-brand/no-name arrows, but I would guess they're coming out of the same factories as name brand arrows and just didn't make spec on spine, straightness, or weight consistency. You might have a couple more culls than you would with a dozen name brand arrows, but at half price, they may be worth a try.
The scare photo posted above can happen with any arrow if it gets abused and reused. In fact, the photo appears to be of a name brand arrow (Carbon Express) based on the vane logo. Check your arrows for cracks (flex and look/listen) when you first get them and again after any hard impacts.