Not being clever but...
I use a standard Asda Indoor broom head. Fit my own jets and costs about a fiver.
OK, maybe they don't last quite as long as the £30 brushes do. I get about 4 months out of one and I have been told a, for example, Gardiner brush lasts about a year.
My brushes are much lighter than even a "Super Light".
My brushes do a good job too.
Please don't think I am saying you're all idiots, just wondering if there is anyone who has done as I do and changed to "Proper" brushes and what their reasons are?
I, personally haven't found a reason to change
Thanks
David