First, check the legality of them where you live.
Second, having the studs torqued correctly is key. Both the studs holding the spacer to the hub and the studs holding the wheel to the spacer.
My opinion is this: unless your rock bouncing or running high horsepower they're fine. But THEY MUST BE TORQUED PROPERLY!
We've had them on a stock C6 Corvette, a highly modified Grand Cherokee running 35" tires, and a tube chassis Toyota pickup with 35" tires powered by a 300hp small block chevy. All without any problems from 20 - 25mm spacers.
Both the Cherokee and 'yota were used heavily at off-road parks. As a matter of fact the Cherokee had to have the steering box welded back on twice but the spacers held up.
My experience is they're ok and most failures are due to user error (not installed/torqued correctly). This is just my experience and those I have went off-roading with.
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