Got a cheap one earlier for five bucks.
Its cool but doesnt spin for very long, squeaks a bit, and one of the caps on the weights already fell off which sucks.
I ordered the tri-black one in
>>6259701 on the bottom row off of amazon (or one that looks like it) and some brass button caps for the center so hopefully it feels nicer and spins longer.
I fidget a lot myself (bouncing my legs, cracking my knuckles and bones, click my pens etc etc) and it does seem to help when I'm just out and about and spinning it.
The design for this one is kinda clunky but hopefully the metal one is better.