I had a horse hair brush (50% mane, 50% tail) for several months, but never came to terms with it. It was a little prickly, which didn’t bother me, but the rest of the face-feel was odd in that it reminded me of a floor mop. I only face lather and one of my favourite brushes is a Kent BK 4, which some regard as the epitome of a floppy brush. Thus, it wasn’t that the horse was not firm, it just had an odd feel on my face. On the other hand, the handle was gorgeous, so I had Vlad Ferdman re-knot it with a TGN 2-band badger; now it’s one of my favoured brushes.