You know, I've always drooled over the Kahr pistols, but never bought one because they were so darned heavy. Finally, the P9 was released, and I snatched up the first one that came into my favorite gun dealer. It must have been one of the first off the production line, because it was a pure LEMON.
I was extremely disappointed; multiple feeding failures, stovepipes, rounds halfway into battery. Kahr worked with me--we tried several recoil springs, a new assembly pin/lever, different mags--the gun was an overpriced joke. I did the 200-300 round break-in period, everything. I finally took my losses and sold it to a pawn shop.
Maybe enough bugs have been ironed out of the P9 to make the MP9 a reliable weapon. I would carry the MP9 a LOT. My S&W 337 AirLite Ti and Kel-Tec P-32 are my regular carry guns.