i have 3 carbon goosenecks.
one on my 25ft SLX with medium extreme brush,i change it to my gooseneck with sill brush for conny roofs/fascias etc
the other one is on my 40FT SUPERMAX with extreme medium mixed brush.
they make velux windows easier to clean and deep sill windows,they are also ultra light.very good piece of kit IMO.
i like the fact the brush is fixed to the gooseneck.no annoying movement of the brush like you sometimes get on screw on goosenecks.sills are easier to clean as well on awkward windows above connies/extensions.
highly recommended
dazmond