I think that is one of the best feeling pistols I have ever seen. I wish they had made it in 9mm P. though it might have had to be beefed up a bit. The SIG 210 is much the same (Petter) design, but is a lot bigger pistol.
The ammo is based somewhat on that for the Pedersen device. The cases are the same, but the French ammo has a longer bullet and won't fit in the PD magazine.