I've had these stools for almost 2 years and no problems! I definitely weigh over 100 pounds, as do most of the people who sit in it. When I first got it, one of these would always sink as soon as you climbed in (which is why I gave it 4 stars instead of 5). Over time this stopped and now they all work perfectly. I had no problems with hacking. They even survived the occasional visit from children who couldn't resist the urge to turn inside them until they became dizzy.
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