This is an interesting trinket, since it adds a fixed ammount to your weapon damage. At ~14 AP = 1 dps a weapon that swung once per second would basically be getting ~98 AP/14 dps with an additional ~15.5 dps being addend in when used. Some investigation would have to be done to determine if this is damage that is normalized or not. If it simply adds a flat adjustent to weapon damage, it would appear that this is a very handy trinket for characters that dual wield fast weapons.
Also, this trinket cycles at twice the speed of most +AP trinkets, making it substantially better.
Patch changes
Patch 3.3.0 (08-Dec-2009): Can now be refunded at its vendor.