Depends on which design of wheel spacers we're talking about. The kind that just has holes your regular studs pass through are pretty easy to build correctly, but may require extra-long studs. It's possible to screw these up, but you pretty much have to try to make them badly. I run a thin lug-centric version on one of my cars in the rear to get more clearance.
The sort that you bolt to your hub and that has a second set of studs to attach your wheel, though, is another story. I've heard a couple horror stories about them. Most of them involve the nuts holding them to the hub coming loose, either because the metal the spacer was made from being too soft or because you may have to take the wheels off and retorque the spacers after 500 miles. Not good.
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