This is not the first device of this type that I have the opportunity to try, but I come to the same conclusion ...
Living in a border region (Lille region), many radio stations are available and cover almost all frequencies, and this type of transmitter proves difficult to use at the end ... The slightest residue station or station disturbs the smooth operation, and listening is at times not very nice, especially when you have to change the frequency in the middle of the pieces ...
On long journeys, ditto. We find a clear frequency. We roll. It starts to sizzle increasingly strong. We must change. etc.
However, I sometimes have the opportunity to ride in more rural areas, and there it already works better, without issuing a rich high quality, but it helps out.
Moderately satisfied, therefore, not the product, but on the principle itself. Try This, however, which medium works in one place may work well in other less dense regions.