As others here have said, many people have obviously purchased Kimbers with external extractors and had problems with them. No one spending $1,000+/- for a pistol is going to be happy with extraction problems. But Kimber sells something like 50,000 weapons a year, so you should keep this in perspective.
I have a Pro Raptor II I bought this past August. During the break-in period, I had a couple of FTEs, which is normal. But once I got past 600 rounds, it operated fine, with one exception. The extracted brass was hitting me in the face (i.e., "clocking") about 30% of the time. I called the Kimber Custom Shop, spoke with Dennis and told him what was happening. He told me to send them the pistol, which I did on December 17th. On January 6th, they called me to tell me they had fixed my Raptor, test fired it, and were sending it back. Preety damn good response time, since two holidays and Kimber's year-end inventory were during that time. I put 6 magazines through the Raptor yesterday, and it works fine. It's the 4" PRO version.
As more veteran members of the forums often say, "YMMV". (Your mileage may vary.) For me, I'm very happy with my 4" Kimber and with Kimber's support. Good luck.