KBs are worth it if you are planning to work out at home and/or limited to freeweights. You can build muscle and strength using them actually depending on your level of fitness. Someone who can bench 300 lbs probably won't be useful for them.
I like to do KB swings, one arm snatches, and single leg deadlifts. (Our gym only carries 60 lb as the heaviest which isn't heavy enough for certain things). All these exercises are replaceable using DBs except for the KB swing. For me, KB swings are invaluable and put it towards the end of my workout as an accessory.
If you are planning to use only KBs as a stand-alone workout, I think it's worth it for general overall fitness. (but I heard they are costly, so stronger you get more KBs to buy)
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