I'm assuming you are referring to the Kahr K9. If so, $550 is not bad for a good one, since the MSRP on a new one is $855 (they are still making them). Kahrs are quality pistols and my experience with four different ones have all been positive. I am a little surprised that you say the K9 fits your large hands well, because it actually has a short trigger reach, combined with an 'upturned' trigger and stingy trigger guard area, that made it very uncomfortable for me to shoot, until I learned how to modify my grip appropriately.
As for relibility, all four of mine have been, and very accurate, too.