The CW45 at Bud's is $371, therefore $500 sounds a little high to me. I enjoyed shooting the P45 and Tp45 I had. I didn't enjoy +P ammo. The guns are very light and recoil gets to be hefty with hot rounds IMHO.
The gun is accurate, the trigger is OK, very suited to and appropriate for it's purpose. I don't care for the standard Kahr sight, therefore I'd recommend and upgrade to another brand, ( Mepro, trijicon, etc.).
Some people complain about the grip being hard on the hand. If so a grip sleeve solves the problem.
I wouldn't pay $500 for a CW9.
If I were to go to a .45 Kahr I'd seriously consider buying a TP45 and cutting the grip down to the CW/P size, thereby keeping it very concealable but with a longer 4" barrel. On paper it sounds like an ideal CCW.