The Dryden faucet, showerhead, tub spout, and diverter spot like crazy.  I contacted Delta regarding this asking for an exchange with the newer model with a spot-resist treatment.   They said NO!  They obviously knew there is a problem with the finish  I paid approximately $1,000 on these items, towel bars, and other accessories for my renovated bathroom.  I thought Delta was a good company until now.  These items are defective and supposedly have a warranty.  Delta does NOT stand by their products.