Considering its vs evades, it would probably miss on anyone who has nice evades. Which should be .. well. Ok anyone with DoF running, or MA/Fixer without it.
The blind ring isnt great because of the -off (though its nice) it would be because of the effect being blinded has on the player behind the PC. Regardless of how seasoned you are, saying it has no effect is a lie, it puts anyone into some form of "panic mode"
And its not ike you have anything to lose by using it. One second execution for a potential confuse/error by your target? Priceless imo