I tried a Whisker Biscuit for a while and didn't really like it. My dropaway seemed more accurate to me.
On a side note, has anyone ever seen this video? It's a guy shooting groups at 135 yards with a Whisker Biscuit. Wonder if he would be just as accurate with a dropaway?
http://www.youtube.com/watch?v=bVbm7y6S5OM