This internal mouthpiece pickup is a fantastic invention. It picks up all the sounds of a clarinet without the cumbersome dual microphone approach. The pickup, being inside the mouthpiece, is immune to feedback, and all the subtlety of one's music comes alive.
The pickup has a thin lightweight cable that does not get in the way, and the connectors seem to be of the highest quality (I say as an electrical engineer).
I followed the YouTube mounting instructions and had no trouble with installation, but if you are not a woodworker or otherwise mechanically skilled then having a skilled technician do the mounting for you is advisable.
This pickup is really an amazing.