Yup they're fine. Actually no, sod that, they're way better than a standard bog brush. They don't end up covered in whatever you've had to be cleaning up with them thanks to the shorter spiky bits.
Controversial.
Personally, I don't care what the brush looks like: the toilet pan is the point.
This JJ product just smears it around. More flushes required. Repeated 'product' use. It's all shit.
I have one of the JJ bog brushes.
It's fine.