Those look frankly nasty - to me that skeleton build looks weaker not stronger than the usual ones.
Like most folk I have several LIDL clamps. They're so cheap that you can't really pass them up but their design (like these) is back to front and I don't like that.
Look at the shape of the handle. The moving trigger is the straight one so the bar sticks forward when you hold them.
Now this is good if you're using them to clamp something down to the edge of your workbench or workmate (because the bars stick downwards when you hold the clamp naturally) but it's the opposite orientation to the Gorilla / Irwin clamps which I prefer.
Also, you have to press the release trigger with your finger, not your thumb (for me thumb is stronger and easier).
600mm clamp is quite a handy size. It might be worth just getting a pair of better ones, like the Irwin or Jorgensen orange ones.