I too have a PM9. I really like the Kahr's in both design and execution, for what it is. They are excellent carry guns. They are not extended shooting target pistols (though I can put about 500 rounds through mine without issue.) To me the biggest advantage and disadvantage to the Kahr is how slim it is. It is great for ease and concealability of carry. Unfortunatly, this slim profile can be detrimental to shooting as the grip starts getting crowded if you have normal to large hands.
All in all, I like my Kahr and am likely to buy another at some point. I do have to agree with LarDog, If Glock started making a pistol of truly equal compact dimensions, I think I would have to buy the Glock, if only for the (anticipated) price difference.