The idea of being able to adjust them sounds great. But in practice, they are just a nuisance. You are constantly having to "fix" them back to your setting whenever someone lands on them accidentally. Which means often/always, depending on the drill you are using them for.
I have not had any break yet, contrary to other reviewers, and these have been abused pretty steadily for a year. So no complaints there.
But I also own a bunch of non-adjustable ones, and those are just so much simpler, quicker to set up and take down, never have to fiddle mid-drill, easy to get out and put away (assuming you have a smart storage system...I port these in a plastic tub).
I would not buy the adjustable type again.