Let me start by saying these fender covers are a steal for the price. I've used them while working on my Honda Civic, and they've saved my paint from more than a few accidental scratches and tool drops.
The magnets aren't the strongest - I did notice some sliding when I was really leaning on them - but the combination of magnets and hooks kept them in place for most jobs. The front cover fits perfectly across my hood, though I wish the side pieces were a bit larger.
What surprised me most was the material quality. The PU leather feels durable, and after several uses (including some rough sessions changing brake pads), there's no visible wear. They fold up neatly in my trunk too.
For weekend mechanics like me who don't need professional-grade protection, these hit the sweet spot between price and performance. Just temper your expectations if you're working on larger vehicles - they might run small for trucks or SUVs.