Yes I have used them.. I just went and bought the stiffest one I could find at TJmaxx.
It works great for the right strain/bud. I used it on my planet of the grapes which is very dense which helps a lot.
Also you want it quite dry.. so I let them get a little over dry, so those leaves pop right off when you run the brush over it.
It doesn’t work as well with airy type buds or very leafy buds..
For the cheap price of one, it’s worth trying frankly..