Michael,
For my son, and i think for most peopel who use it, it helps to keep the knob from riding up into the hand.
Im sure you have seen the new maple bats that have become very wide spread over the last couple of years with the huge knob on them...Many pro use bats with a non-standard knob.
The most notable off the top of my head is Sammy Sosa.
http://www.americanmemorabilia.com/Auction_Item.asp?Auction_ID=6631Here is a pic of a used Sosa bat i found online.
The power pad does the same thing that all the tape does, except it is designed to fit on the knob of a regulation bat. It is not aiding the grip on the bat, but assisting in keeping the bat knob from sliding into the palm of the hand.
Here is a pic of another game bat of Sosa's with the tape removed.
http://www.americanmemorabilia.com/Auction_Item.asp?auction_id=3453Here is a pic of the Powwer pad on a bat
http://store.softballfans.com/index.asp?PageAction=VIEWPROD&ProdID=299Now, I do not have the Federation Rule Book, but are we seriously saying that the tape job that Sosa does is legal and safe, but the the Easton Power Pad is not?