It's just my opinion but I feel the Whisker biscuit is much better than the Whisper disk.
I was at an outdoor hunters 3d shoot a couple years ago and I had some blow hard spouting off about how his buddys friends brothers cousin (you know the type) was hunting with a WB in the rain and he missed a nice buck because his arrow just fell out the end of his bow after the shot because the biscuit was saturated with water.
So I just had to make him look foolish I walked down by the creek , held my bow horizontal and dipped my WB in the creek. I then stuck my feather fletchings in the creek to saturate them as well. We then walked back up to the hunters steak wich was about 25 yards and I dropped one right in the 10 ring. The guys watching (except Mr. Blow Hard) said it was the coolest thing they've ever seen , they said there was a cloud of mist when I shot.