Sorry about your misfortune on missing your deer. But personally I don't really like the idea. One is the legality issue earlier. two any electronics on your bow (including lighted nocks) makes a P&Y entry invalid. three - more weight on the bow.
I prefer to use my RX range finder once I am in my stand and take ranges on objects in every direction where I can take a shot out to my self imposed range limit. Then I am ready when a shot presents itself.