The voice quality is really great: So far I have occasionally used the speakerphone my old phone, but I have often then by the other party to comment heard: "Did you just put on loud speaker, you sound so far away to?!?" I now lead almost all calls via the Gigaset L410 and people notice no difference whether I "normal" talking on the phone with them or via the hands-free clip. The speaker is also loud enough so that I can understand them well (even if I eg. The way to cook).
Operation is simple. The L410 has actually only one button: The "On / Off hook" button. With this key you can directly accept the calls. When I call someone, then I dial the number on my phone (a new Gigaset SL400) and then press the "lift-off" button on the L410. Even I have a conversation on the L410.
The only minimal shortcoming that I noticed so far: Before you can take the L410 in operation, it is necessary to "purely friemeln" the battery once. But after 2 minutes I had it done and even the small effort was it the face of hinzugewonnnen telephony comfort worth.
The L410 is certainly also a great gift idea for people who actually already have everything ;-)