importantly, for our dire emergency burning-up planet, it saves on hot water (natural gas in my case) usage and the subsequent methane and CO2 emissions that come with it.
As I recall, these were pushed by utility flyers in the 1980's and maybe into the 90's as a conservation measure, and that one could request for free. Might still be, I haven't noticed in a long time.
That said, I didn't notice the difference before and after putting the restrictor in. Maybe makes a difference for people who like running their shower super full blast (and now they can't with the restrictor), but for me I'm happy with a good spray. Probably the restrictor isn't making a difference for me.
I've never made enough of an effort, but I would like to find some kind of lever thing that I can easily adjust the flow volume/strength, including all the way off, rather than doing so by turning the hot faucet handle and the cold faucet handle (separate handles) and getting that right so the temperature is right, and then repeating above in reverse when I want to adjust the volume back up. Kind of lazy and dumb of me now that I think about it to have not shopped for some kind of solution to this, but my life is such that I have time to do about 50% of the things I feel I should do, and this just had never made the 50% cutoff yet.
I just put it on my Amazon shopping list to at least read about what I can do (though after educating myself about my options, will prefer to get it at the local hardware store). Or just buy a freaking new showerhead with such a feature, should be easy to find. With a reference to this post 
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