Well we had ordered this new faucet to be installed with the granite countertops.  Long story short the plumber spent 25 minutes on the phone with Delta to troubleshoot because the red LED light would not function on the faucet.  It was determined they would have to ship out a new part that would arrive in about six weeks. So what does that tell you? There must be a lot of demand for said part.  So who is going to pay the extra $100+ dollars to have a plumber come out to completely deinstall the faucet which has to be done, in order to replace the LED part and then reinstall the faucet?  Those extra bells and whistles will cost you