Prior to this year, I would generally be hiking uphill through Trail Camp at dawn. I would get to a spot around Switchback #15-20 where the snow melt water had been flowing across the trail, and then it froze overnight. So, suddenly I would hit the slick patch and start to spin out. But that wasn't enough to warrant using microspikes.
Higher up, the packed snow is likely slicker, so it wouldn't be stupid to have microspikes along.
