Okay, so I finally got around to testing these stripping wheels on some seriously rusted metal projects. Here's the real deal:

First impression? The black discs are WORKHORSES. I blasted through decades-old rust on industrial tables like it was nothing. Used two black ones and a blue for tougher spots - still got life left in them!

Pro tip: Wear a mask! The rust dust is nasty, and whatever these discs are made of isn't exactly breathable either.

Surprise win: They worked magic on my wife's rusted lawn ornaments (RIP butterfly sculpture). The before/after difference was insane - like bringing metal back from the dead.

Small warning: Don't believe the 'won't damage underlying materials' claim completely. These bad boys are aggressive - I wouldn't use them on delicate wood surfaces unless you're ready for some serious material removal.

At under $3 per wheel? Absolute steal compared to brand-name options. Performed just as well as my usual expensive ones without the markup.

Final verdict: If you've got rust, paint, or coatings to remove from metal surfaces, these will become your new best friends. Just don't forget your PPE!