We bought the Grohe Ladylux Cafe faucet for our kitchen sink and the Ladybug for our prep sink. We assumed that the spray function would click on and stay on until we turned it off--all the other Grohe models we looked at do and our Ladybug does. We find that Grohe did a peculiar thing with this, may I say, pricey faucet model--they made it so you have to hold the button for the spray function to continue. Another reviewer on another site had the same complaint and found that the rubber button for the spray function was wearing off after 2 years. Ours is only a few months old...I guess this function frustration AND the wearing out of the button is what I have to deal with. What was Grohe thinking? I should have bought Hansgrohe--they make engineering sense.