Some of the differences I recognized...
Half-Pipes cars appear to ride on a single "skateboard/snowboard" that "flexes" instead of two distinct cars. Also the seating is arranged in an outward facing position instead of rows of seats. Finally, your legs dangle, albeit slightly in this version.
I was looking at the pics on roller coaster database and was wondering if this ride will have a maximum height limit as it looks like the taller you are, the closer your feet are to the platform...unless something moves up or down during loading that could hurt.