I have a CCP and have put approximately 1,000 rounds through it. The following are issues that I noted with it:
1. Field stripping is a function that you will need to practice on, Walther over engineered the design and therefore tear down is not easy. Putting it back together is not easy either. Practice will make it simpler.
2. Magazines need to be exercised and thoroughly cleaned after each using.
3. Good quality ammunition; Winchester 115 grain fmj, UMC 115 grain fmj and quality self defense ammo will make life easier.
4. Good cleaning after each use.
The negatives being stated, it has fairly light recoil and is an extremely accurate shooter and on a person of above average size (5'10" to 6'+, 180 lbs) is an excellent concealed carry firearm.
Walther offers a very good video on maintenance and there is a Walther user group for the CCP which offers much good information.
Bottom line for me is that I'm glad that I bought it and did not give up on it.