I'm going to guess that you always use the extreme brush with this pole.. 90% of the time I use the extreme stiff brushes
A wise choice my friend
Seriously aside, yes I always use the extreme brush.
Flocked soft: for leaded (and my old knackered one works better than my new one)
Medium: I was always was a fan of this until I tried...
Stiff: Lovely, doesn't lose it's shape too quickly, I even use this for first cleans, a bit 'scratchy' across the glass (not sure if that's good or bad) noisy on front and back pvc doors, but really does the biz. I do love this brush. Also the dirt does not tend to 'cling' to the brush, so a quick shake and you're ready to go.
Having said that I reckon the best brush by far is the Gardiners medium sill brush. I use that on bungalows and really bad first cleans. Too heavy to use on an xtreme pole IMO. We need a lighter version please Alex.