Speed dependent volume does/will not eliminate the need to adjust the volume. You just don't need to mess with it quite as often. There are far too many uncontrolled variables affecting the perceived "signal to noise ratio" to expect to totally eliminate the need to adjust the volume. (Your passenger complains...!)

Still SDV can be a nice improvement over nothing at all, kind of in the same catagory as "VolAdj" incorporated in Hijack.

Lynn