I've had this product for about 2.5 years.  At first it was great.  Then after just one year, the spray lever on the pull-out became stuck in the spray mode.  So I had to start using a rubber band just to keep the lever in the regular flow mode.  Real classy.  Then the faucet started with a tremendous hum and rattle when I tried to use hot and even warm water.  Finally, at the two-year mark, the water pressure started dropping to almost nothing.  Had to have my plumber replace the faucet head.  How long will this solution last???