Well in my limited experience it seems like a very good brush, it is light, it has splay, it is monofilament, it has crinkle filaments, it has longer bristles on the outer side, and short stiffer bristles in the middle. You really feel when using it that you are scrubbing dirt off the glass, not just rubbing it. The middle short bristle like filaments feel really sharp and effective, while the outer ones catch larger pieces of dirt. It is also very light ( 375 grams ) and it does fit a vikan thread.
One possible negative is the jets, they seem very thick ( as in thick stream of water )....but I held it in a bucket and after a minute it had barely filled a 1 cm so it doesnt use too much water....I think
Compared to the Vikans I think it is better, but remember I have only a limited amount of experience. On the other hand I did clean my house with it and the windows are spotless ( tap water tds 34 ). Luke