I am using this line on a PVP server and raiding and with a 79.8 dps 1 hander I do more damage then with my 59 dps 1 dual wields. The great thing about the double attack portion of the skill is it allows procs to go off much more often because of delay and the double attack isn't normalized so when you double attack it is as if you swing twice not just once like with dual wield.