This weekend I got to take my brand new 151 Burton X8 on her maiden voyage. The set up I used was the Burton EST Binding system with 07 Burton Sabbath boots.
On Groom: I was extremely impressed with how well this board handled higher speeds for its size. The board was very stable, nimble and very responsive on hardpack. As a result of the added torsional flex of the ICS system, it was very easy to feel the terrain you were moving over changing. I was able to feel how the terrain was changing and orient my body accordingly to ride as smooth as possible. The WFO base was also fast as hell. I did however, feel a good bit of foot fatigue while using the EST binding system due to the increased foot flex and roll on the board.
What if you tried the bindings EST w/o the cush?