Well, it's not
that bad, really.
Which buckle is the best, that seems to be a matter of taste as much as it is one of facts.
Those buckles want some force to be applied before they close properly, so don't be afraid to push down hard.
Then try closing the buckle under tension, or pulling from both sides of the buckle after pushing down the lever, that will close it better.
play around with it and You'll find out how to best keep the thing shut.
