I bought this Delta Cassidy pull out sprayer faucet in Feb. 2017 and it's already failing.  It's clogged, I have little water pressure, and I know it isn't the pipes since when I changed out the old faucet for this one, the pressure was about three times better than it had been.  The difference was astounding.  So it was the faucet that was the problem last time, and it's the faucet that's the problem again this time, and it only took a year and nine months to clog (it has been this way for about a month now).  Delta advertises this as "lifetime of Reliable Performance as well as self cleaning and it's neither.