Yes, I would say it is PM9 sized.
I would prefer that size gun to be in 9mm, but I suspect that is Glock's next move.
It is more shootable than a Ruger LCP or even a Rohrbaugh 380 -- just because of the size. The grip is bigger, the sights are bigger, the controls are full size, the slide is easier to manipulate, etc.
For me, I would rather carry a 9mm Shield if I had this size gun, but I can see how some would appreciate the softer recoiling .380 ACP.
This gun is exciting, but the likely forthcoming 9mm is very exciting too. I have been waiting for some company to produce a gun that I like to a micro, compact, and full-size. Glock is getting close, and a 9mm would make the perfect set with my G19 and G17/34.