Ok, I've searched around some and I've narrowed down my selections to these two brushes to clean my simpson triple wall 6" stainless pipe. It's a straight run and I'm comfortable on the roof so that's not much of an issue. I'm wondering if anyone has experience with these brushes? The PB-6 is about 5x the price of the 16906. I don't mind paying the extra money if it's worth it, but I'll also have to get new rods if I get the PB-6, for the 16906 I can borrow my dad's. So is it worth it to upgrade to the PB-6? Does it clean better?