We bought the faucets and sinks awhile before we started using them cause we built our own cabinets. We couldn't wait until we could use them but it was awhile because we were also rebuilding the entire house as well. 
When we were finally able to start using them we started having a problem with the cold water. One call to Pfister customer service and they sent us a replacement cartridge with no questions and now they have been working great ever since.
Great products and great service!