Used the stifff extreme yesterday.
Took it off after a morning. 
A supreme brush cleans so much better. What I realised now is that a stiff extreme brush with an extreme pole is just too light for maintenance cleaning. It Skips over the dirt like a comb. Where’s a slightly heavier brush can do the work for you. I don’t have to put pressure on the glass at all.
All just my opinion of course. ☺️
Absolutely my point as to what my experience is, hence why i really like and can endure the brushes that i use and add hot water to the mix and work on maintenance cleans is very easy indeed.
Ita a bit like ones trying to get their heads around turning the water flow up, saves you water. They dont get it until they try.
Its finding the balance between aggression and weight.
I was using the tucker with the rinse bar, coming in at 300 grammes was too heavy and not needed. The extreme is adequately aggressive for 4-8 weekly and feather light. I think the ultimate is about the right weight at 180 grammes, the best one for aggression is the hybrid but it splays way too much.
I have looked at them streamline brushes, the jets and connections alone are 120 grammes-more than an extreme brush.
You do need some weight, but anything after that is diminishing returns.
