I think the correct answer right now is: Sometimes.
According to friend who does a lot of testing on the Preview server, the offhand bonus seems to work for a bit, then goes away. I have no idea - nor does he - what is causing this. You're probably better off choosing a different bonus for now.
Isaac the Adequate - Level 70 Oath of Protection Paladin
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TBT all of the offhand bonuses have been flaky lately I have noticed this since mod 10 started I have used Pathfinders action Lone Wolf and AOTP and they are undependable at best but AOTP does the most so I stay with it
Comments
According to friend who does a lot of testing on the Preview server, the offhand bonus seems to work for a bit, then goes away. I have no idea - nor does he - what is causing this. You're probably better off choosing a different bonus for now.