Drilling a bowling ball is pure physics, no matter what you are drilling it with.
If you have a device to hold the ball in a stable position [KMT jig does], and a guide to help you position the ball correctly [does this also], and a way to control the drilling angle [KMT is 3 for 3 so far], you can drill a bowling ball with reproducible results.
Now, you throw in some good drill bits [which, by every account I've seen, this comes with really good ones designed specifically for this system], and you have all you need to do the job. The knowledge and ability to get good results are up to the person using it.
Having had drilling experience in the past, I would buy one of these in a minute if I had the expendable funds.