Sturdy enough so far, but I am only 3-weeks new to using landmines at all since the Gym always had alternatives. There is just a tiny bit of wiggle in the plates, but no real movement. That said, I just ordered the two landmines below in hopes I can figure out a way to mount one (or both for a high and low mount) to the DB rack and free up those 35's. I'll just return or re-sell whatever I don't use.

https://www.amazon.com/gp/product/B07G29T7VW
https://www.amazon.com/gp/product/B01077P1W2