I had a faucet (not Delta) a few years old that started leaking at the joint to the side sprayer. If I had been able to see it and get to the fitting I might have been able to fix it, but you know how it is getting under the sink - agggh! Well, looking for the new one is always a trick. The standard configuration was fine for us and we've had good results with Delta so we went with the Classic. Good news, didn't have to get new hoses (included integral to the unit) and the side sprayer attachment was literally plug and play with a little twist of the wrist for the connector. Everything fit, everything worked, quick and easy. Now if they can just come up with a system that you don't have to get under the sink - ha. Life time warranty is a plus as well.