Originally posted by DanH:
It's pretty much a feature that's only found on gamer guns that has little practical use unless you're running USPSA or 3 Gun and you're trying to cut tenths out of your time. It's more helpful on ported/comp guns as you're getting recoil reduction from the ports. It's more than snake oil magic, but if it's worth it or not is down to the person.
Edit: Here's the picture up close with the hypercomp. It's pinned through the added material above the barrel and the ports and has no contact with the bore.