I switched to FB, and did them for about 5 months. Made great gains. Currently doing a more traditional split, but can see going back to FB at some point.
The volume (or what looks like a lack of..) does throw some folks off, until they do three days a week of FB. The volume (if set up correctly in the beginning) is more than enough in most cases to promote growth, if the diet is right and the intensity is there.
I'm your Huckleberry....