Kimber's fit and finish has been consistently excellent over the years. Kimber pioneered the use of MIM small parts when they entered the market, and in the beginning...things were very good. In the last few years, they've apparently changed vendors for those parts, or the old vendor has dropped off a bit on QA because the parts have been hit and miss recently.
Colt has also made use of a good many MIM parts, and they've been consistently good from the beginning until the present. I've heard of very few failures, and have experienced none with any Colt OEM part made with the MIM process.
As far as Kimber goes, the base gun is good to go...as good as any and better than many. Just be aware that there have been some intermittent problems with the Swartz system on the Series 2 pistols, but Kimber will sort that out under warranty.