Also bought this similar spinner from Amazon a few days later for $10 less, and it's not even close to the quality.

The Tyzest is half an ounce heavier, and I've been able to get 5+ minute spin times with it. The second link, Senqiao, says it's zinc alloy (brass?) but is half an ounce lighter, so it only gets about 3 minute spin times. But its light weight makes it spin up way faster, so if you can get over the cheaper feel you might like it.

Just a little mini review there.