We bought this faucet last week and just got it installed and it didn't even last a week! The first couple days were fine. The faucet and hand sprayer both worked great until about day four. Then the water pressure out of the faucet and hand sprayer both flucuated WILDLY from one minute to the next! This is so frustrating because we expected so much more from Moen considering what we paid for the faucet. 
We contacted Moen and explained the problem to them and they were very cooperative. They promptly expedited a couple repalcement parts for us to install to see if that fixes the problem(s). So even though the faucet has been a big disappointment so far, at least the Moen customer service was as great as always. So now we'll wait for the new parts and hopefully they'll fix whatever has already gone wrong with the faucet.