As with other reviews, annoying "thumping" sound and sprayer is weak. Replaced our 12 year old Delta faucet due to hard water issues. Purchased the closest model to what we had. Thumps when you turn on the water, sometimes switching from cold to hot. When trying to use the sprayer, the thump starts and a weak flow of water comes out. Turn off sprayer and then the faucet doesn't work. Play around with the handle to get water flowing again. 
My fault I should have researched and read the reviews, since the last one lasted 12 years, thought the new one would work the same.