I used for a bit and never had a problem but I can't say I put it through a hard life. It hold the saddle fine but it doesn't seem the most heavy duty seat post available. Let's say that I would not esitate to use it on the street but off road there probably better option.
I have one of this https://es.aliexpress.com/item/32969142304.html? it's very light and with a Thompson style head