I had been really looking forward to this beautiful piece, but unfortunately the brush is unfortunately not to use with us. We have a washdown and we do not come up with the brush unfortunately to bottom down as the brush or the transition from stem to silicone is too broad for our toilet. The mentioned cleaning under the toilet rim does not really work, because the stem is too long for this.
Also the statement 'no accumulation of dirt' I can not confirm, but these can be removed much more easily.
I think the idea of this brush great, but unfortunately must again change to the constantly renewing bristle variant.