I have never ridden YFZ shocks on a Banshee, but I have spent a lot of time on a YFZ450. I personally think the YFZ450 shocks are way to stiff... mind you I only ride in the sand, so the YFZ shocks might be great for an MX track. I have a set of Works dual rate without the rezzies on the front with LSR +2 +1 arms, and I think they are great! I also have a dual rate TCS shock with rez on a +6 CFM swing arm, and it feels like a champ! It's all in what you do man!
Just my .02