Never used a WB as I don't want anything in contact with the shaft and fletching the entire time the arrow is leaving the bow. When timed properly the drop away is only in contact while the arrow is stationary and at the moment the shot is initiated. Besides the rest dropping away, the arrow will bend over or around the rest depending on whether the archer uses a mechanical release or fingers.
I am shocked that WBs work as well as people claim. But, I believe the Las Vegas NFAA tourney several years ago was won by an archer with a WB. That being said, I recommend staying away from WBs as they go against all rational thinking regarding external influences on the physics of arrow flight.