There are two issues for me. One is with minimalist footwear in general and the other is with the Merrell specifically. I have a hard time running downhill fast in minimal footwear if the conditions are such that I would normally be able to cruise. Under those circumstances I prefer some heel with cushioning. Minimal footwear is still OK for steep/technical downhill. Yesterday I did a very technical and steep run and I discovered that toward the end of the run when my legs were particularly fatigued, the protective front of the Merrell made it seem as if I were trying to run in clown shoes; they kept catching on bigger rocks or roots which cause me to stumble a lot. I like the roominess of the toe box but maybe the protective rubber toe protection on the outside could be reduced a bit. I'd rather risk a little toe stub than a fall into jagged rocks on a steep trail.
University of Colorado campus to the right side of my head from Bear Peak
Trail to summit of Bear Peak over my right shoulder