I used one for a long time. I still love the simplicity of them. But over time as my shooting got better I realized I was able to notice limitations in my setup that were affecting my accuracy. When I switched away from a biscuit, I noticed two things: 1) my flyers weren't as pronounced (e.g., my bow was more forgiving) and 2) it was easier to tune so that my broadheads were closer to my field points.
For #1, I'll take all of the forgiveness I can get. I base my effective range for hunting off of my worst-case scenario. I want to know that if I really F*** up, my arrow is probably still in the vitals.
For #2, I could have theoretically fixed this without switching away from the WB. But with my last bow I spent a lot of time trying - several approaches, hundreds of shot arrows. When I switched to a drop away I had my problem fixed in one session.
One of the things that I worried about when switching was loosing the arrow containment of the WB. But it really hasn't been a big deal. I have a full containment drop away and I feel very comfortable stalking with it. Compared with the WB it is a wash. The drop away can make a bit of noise if the arrow rattles around, but it is actually full containment - whereas with my WB I would occasionally knock the arrow out of the rest.