Such contraptions are known as, unsurprisingly, rotary rock tumblers. But what [Fraens] has put together here is a vibratory tumbler, which…well, it vibrates. If this was Rockaday we might go ...

Such contraptions are known as, unsurprisingly, rotary rock tumblers. But what [Fraens] has put together here is a vibratory tumbler, which…well, it vibrates. If this was Rockaday we might go ...

the Owala Tumbler. Read the full review below. As with most things that transcend mainstream popularity, the cup's meteoric success has garnered legions of both fans and doubters, with many ...

Read more about our Product Review Guidelines here. All of the internet hype surround these cups has led many — frankly, myself included — to ask earnestly: is the Stanley tumbler really worth ...