I have an original early 70's 22 short NAA, and a newer .22 mag NAA.
I honestly carry the 22 mag quite a bit. Like you said, it's super easy to conceal.
I can't say enough good about North American Arms customer service. My dad got the 22 short back in either the late 60's or early 70's when they first came out, and passed it on to me.
The cyl wouldn't turn properly when cocked, so I called them. Long story short, they fixed the guts, replaced the cyl with the new "safety cyl", hammer, trigger, and barrel, and mailed it back to me with a brand new set of their walnut grips.. that they sell on the site for like 20 bucks.
Didn't charge me a dime.
We've had this little bugger over 40 years. They were concerned that it might be one of the first run pistols with a pinned barrel. If that was the case, they said it'd break when they attempted to remove it, and that they'd just send me a new one. :hmmmm2:
Now THAT is customer service.