I have a set that I have had for years. I like them. Do not get cheapies.... I came down out of a tree when two broke, while helping a lady friend set hers up. Her steps were not what I would have bought... much lighter weight.
The trick I learned is, when you install them, pull them tight and while holding the strap tight, pull up a bit on the locking lever (spring loaded) so it bites into the strap right off. Once I started doing that, I had never a problem. Before that they sometimes slipped a bit. I have a bag of ten and I can go 25 feet up a tree pretty easily.
Please learn to use a safety harness going up and down as well as while in your stand. Use the excuse that it frees both hands to work the steps.
ChuckC