Of course it is, Stevepow!
The Agfa Super Silnette is so called because its shutter sound is so silence.
And indeed I wouldn't have believed it until I personally pressed it.
And as for the Canonet, it is really a lovely machine because of the Selenium sensors surrounding its lens's front element.
And also to mention, the base-plate frame advance lever, as opposed to a usual top-plate advance.
This makes it almost like the Leicavits of the Leica rangefinders.
Like yourself, I would love to hear from any of the other users of this forum.