I'm not massively experienced in the use of brushes but these seem to be pretty good for what they are. So far, they've last very well and still look, feel and play like new. Lovely.
I think this is a case of 'each to their own', the same as your choice in thickness of regular sticks or hot rods. However, for me they feel nice, produce the right sort sound I was expected and continue to be good. If I were to find a negative, I'd say that the metal brushes themselves were a little lightweight for my liking - again though, personal preference!