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I own a pair and have used them. You want thick gloves with lots of padding on the back or they'll fuck up your hands. Pretty much useless for climbing straight up a tree like spiderman or something, but if you can get your arms partway around the tree then they work great, especially with the foot claws too.
They are also handy for climbing up brick walls with small gaps in the bricks, but it takes practice. Btw I wouldn't trust these things with your life or do anything too crazy with them, pretty sure they're made with very cheap metal in China.
