Are those vibrating baby swings worth the money?

i saw these at kmart..kinda cute..i was given a used swing..plays music and such but it takes up soooooo much room ..the vibrating one i saw at kmart took up alot less room. but i honestly dont know if its worth getting a vibrating one..i couldnt believe they make vibrating bassinets as well.
Update: oops i forgot they make bouncers and swings..ok which is better to have when you have 2 idiotic cats lol
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