So upside is I can sense bodies of chakra in the area or something that would "bing" my senses, for lack of better words. The downside is the fact that it is not precise. It is merely a gauge to see what possibly is around or what is happeneing opposed to something like sharingan where you can see specific bodies of chakra or something like Byakugan that can actually see your literal chakra network. So if something happens behind me, I may know it is behind me, but I cannot pinpoint it. Such as it being over my head, underneath me, etc. Or if someone is in the area, I may be able to feel where, in a general direction, butits more vague than anything. But still helps. Just a less precise version of other type of sensing or doujutsu.