SM crashed when I tried Expert less than a second into the chart.
EDIT: It worked the second time :P
I don't like the Expert chart at all. Anyone can make a 1:30 eighth note run and call it a 15-foot chart. 2/5 for the 15 for that particular difficulty.
EDIT2: Heavy is better, but the steps don't do anything creative. =P 3.5/5 or 4/5.