Good but nowhere near great.
The brush works well for a quick job but if you're like me and have really thick hair that also knots relatively easily then I'd suggest an O&M brush. I find this brush has issues with getting any sort of knots out quickly or effectively as I'll brush over the same bit of hair many times and still have the knot barely any different. It's the same situation for when my hair is wet; the brush will take forever to make any sort of difference with my hair and I find when I finally untangle one section and brush a neighbouring section that it'll just re-tangle. I don't have curly hair, it's just straight-wavy and THICK. The bristles feel good on the scalp though and it does a nice job if you've got nothing to detangle in your hair but as it's supposed to be a detangling brush - I find it missing the mark and not worth the money as their are better brushes out there for less.