Hi , tried the quobba fins in my 9'1" Creek today . Again improved turning and speed waves were nice waist to head hi rights and lefts , pretty fun . got tipped off a bit too much but at times the ocean was a bit wobbly , and thats part of supping eh bugger . My opinion is that it made the Creek feel looser and faster and easier to engage a rail . nothing flash just fun surfing made better , So quobba a big yes for me ,as they work in 10 ft style and now the creek .