Laughably bad idea on multiple fronts.
They tell you to center the sleeve on your rest, which will shift the launch angle of your arrow upward. If calibrated properly, that upward shift
might keep your arrows hitting behind your uppermost sight pin (I assume this is the basis of their claim that "Bad Boys are engineered to shoot where your current arrow is dialed in; It’ll hit the same place around 20-30 yards"). However, your pin gaps will still widen due to the increased arrow weight, and, by shifting the launch angle upward, you just took your bow out of tune and induced nock low flight.
They claim one size fits all arrow shafts from standard to micro diameter. The ID of the sleeve has to be sized for the larger end of the arrow shaft spectrum, which means you'll have a gap upwards of 1/16" if you used it on a micro diameter shaft. Their solution is to slip a few layers of heat shrink tubing over your arrow shaft to fill the gap.
The "drastically increased kinetic energy" claim is a farce. You might gain a couple ft-lbs depending on how heavy of a Bad Idea you slap on your arrow. The bow determines your KE; the arrow has very little effect.
The excessively large OD of the sleeve can't be a good thing for penetration. The extra weight might still improve penetration potential on net, but a smaller diameter, more streamlined design would be better.
There are many good ways to add weight to the front of your arrow...Bad Boys are a very bad way.