Are pull-down kitchen sink sprayers good?

The plumber just suggested I buy my own new kitchen faucet with a pull-down sprayer. I really didn't know what he was talking about. Then I saw them online. Do I want this? Do I need this? I never use the regular sprayer that is with my current kitchen faucet.

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Threepio

I say NO to both need and want, but I am BIASED..

Why?.... Because we have really hard water in my town and if you use and sprayer, whether detached or a "pull-down" at the end of the faucet, it becomes clogged with calcium deposits within a year and that looks like YUCK.... So you end up buying a new faucet for $250 or so and start the process all over again.

I have had a faucet with a detached sprayer for over 10 years. I DO NOT use the detached spray (but it fills the hole in the sink ledge) and the set-up works just fine,

BTW: I did notice that the 'big-box' home improvement places no longer stock faucets like mine, They all have the 'pull-down' sprayer ones now.