Got this weapon last night, after taking down the general for a guild rogue...at first glance the stats didnt look that impressive, but, I decided to work out the ratio at my level anyway.
(ignoring everything but damage/delay/damagebonus, damage bonus of a lvl65)
Primary:
Edge: 14(+13) = 27/25 = 0.92 ratio
DLB: 22(+13) = 35/34 = 0.97 ratio
SAoS: 14 (+13) = 27/21 = 0.77 ratio
Offhand:
Edge: 14/25 = 1.78
DLB: 22/34 = 1.58
SAoS: 14/21 = 1.5
Fully hasted am guess SAoS + Edge will outdamage SAoS + DLB, will have to parse to find out though. (no epic.../cry....close though ;p)