The cartridge failed after <2 years, which to Delta's credit was replaced under warranty.  However, we were sick of the low flow from this faucet, and I finally attempted to pull out the flow restrictor at the nozzle only to find that it's integral to the faucet, so not it's ruined and have find a better faucet.  Also, this faucet uses some oddball oversized rosette washers (the "nuts" that secure the faucet body to the sink) that seemingly aren't available anywhere; why, I have no idea.