What do others say? These are actual letters and emails I received. (All published here with permission of the authors)

Dear Marten,

I have had time to try out the head piece now & it is really good . It feels
really comfortable and I can produce a strong bright sound on it.

Thanks very much & wishing you a very Merry Christmas.

Best regards Hazel Hunter

Dear Mr. Visser
I would like to thank you very much.
With the repairs and overhauls done by you I am very content as they are carried out carefully, appropriately, quick and affordably.
A special facilitation in exercising my profession as flute teacher is brought to me by the headjoint made by you in the Swan Neck shape, which sounds beautiful.
I look forward to a long and succesful cooperation.

Many regards, your
Gabriele Taubhorn
(translated from German)

Hi Maarten,
It has been a few months ago that you made an adaptive headjoint for my flute. By now, I am using it with great pleasure.
Shortly after I received the headjoint I went to an international contest in Valencia (Spain) with the band I was playing with at that time. Guess what... we won!
It was a brilliant experience, thanks, amongs other things, to the special headjoint, so... Maarten, thanks!
best wishes,
Janneke Baaij (translated from Dutch)

Dear Maarten,

Just to let you know that I am very happy with the swanneck I use with fluteplaying.
For me, with severe arthrose problems, really the difference between continuing playing or being forced to stop.

Also, I am content with the time you took to help me with the purchase.
I wich you much success with your work. You can use may name adress and phone number for referring to others.

greetings, Els van Vliet
(translated from Dutch)

Hi Maarten,

I just want to thank you for my new flute. Now I have to learn everything again, embouchure, technique, just everything. But the flute sounds so good! Gabi was a little jealous of me.

I am very happy and thanks to the flute I suffer no pain anymore.

Manuela
(translated from Dutch)

Flute playing has been extremely painful since August of 1998 because of injuries I received in a car accident. The injury was in the neck, basically 'nothing major' - whiplash, but playing became excruciatingly painful especially when playing for more than half an hour. I play professionally. My brother and I are a duo - flute and string bass - and we play at a restaurant Wednesday nights for three hours. It has been a real mixture of joy and pain. Thanks to you, it is now pure joy once again.
Thank you, Thank you. I can't say it enough. I'm surprised more people don't know about you and your headjoints!

Pat Radencic