A couple of days ago, we got to see the dreaded "LO" on the Precison Xtra. Zach had friends from out of town that showed up mid-morning to surprise him and he had just woken up. He was a little grouchy and had no energy. His mom told him to check his BS and sure enough, "LO" pops up. We got him juice and then fed him and he came back up alright, but the kid never did do or say anything more than he was still tired. D with a high pain/discomfort tolerance is not always a good thing.