An acrylic NOS was my quiet morning call for a few seasons. Loved how it ran except that I couldn't really jump on it and have the teeth to get a reflex response to pull wary birds back in line. When the Microhen came out, I gave it a shot, and the NOS quickly became just a truck call until I gave it to a SIL who admired it. The Microhen is simply a more versatile call in terms of both volume and tone range.
Fwiw, after retiring The NOS from the field I'd replaced the acrylic toneboard with a hedge one, the sound of which I liked even better. But it was, of course, still just as limited by the 1/4" bore.
If you think I'm wrong, you might be right.