I've used a 35cm Extreme natural hybrid brush with pencil jets, for domestic work.
For me: It doesn't work! It doesn't make me any quicker. 
However, the brush is excellent and very much suited to large panes of glass. 
For commercial work, I think it would be great (lots of large panes of glass).
And as Slacky said, I would go 4 red fan jets (on full power), rather than pencil jets. 
Twice over the glass, job done.