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The process is exactly like sanding out your barrel. You start with a few shots (always much reduced loads, BTW!) with coarse abrasives, then several more with successively finer grits. Even if it does polish the bore, it always dulls the lands and removes some of the throat - and those are both bad things.
I'd only consider doing this with an extremely rough or extremely fouled barrel. An example might be a military surplus rifle with a poor bore. But I'd treat it as the "last chance" technique for any other gun. In other words, if you are having trouble with a barrel, I'd try EVERYTHING else before I tried the abrasive bullet process.
You have a lot to lose and only a theoretical chance of something to gain with these things.
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