3 of us on the east coast clubbed together to share one.We are all pleased with the results.2 have Coppercoat and use the harder sponge and I use the softer one as I have traditional eroding antifoul.We all have fin keelers and with the long handle can clean the fin keel.You need to have the wind blowing off your berth to give you space to get the handle right down the side.The sponge has lasted well and has at least another year left in it.
Haven't figured how to link to a previous thread, but it is all here. Using the search option in the header bar, enter 'Hullmate/Brizo hull cleaning system review'..