It is a match made in heaven! They fit like they were made for each other. Well, they in fact were made for each other. Bell made the Qualifier DLX to accommodate the Bell Sena SMH10 and the Cardo Scala Rider Q1/Q3. The Bell Qualifier DLX has a removable door to fit in the appropriate unit. You can not beat the fit and finish of the Q3 in the DLX. It fits in the helmets pre designated port seamlessly. There are no exposed wires and it does not protrude out like others. it is a thin model to begin with, but when fitted in the indented area on the Bell DLX it is just perfect. To get the seamless fit and finish you need to buy the Bell Scala Rider adapter. I can not stress how clean of a look it is.