With the Invoker's Set being buffed in patch 2.4, Sanguinary Vambraces seem to me as an interesting item for the build or even maybe BIS?!
The problem is that I do not know how often they proc. Has anyone actually tested them? No speculations please...
"Truth is like a lion. Don't try to defend it. Let it loose. It will defend itself" Augustine of Hippo
i would like to know that too but it seems like no one cares or reads here.
I seriously believe nobody really knows. I have read on reddit that they proc around 10-20% of the times you are hit. No serious data tho.