Early tests indicated it had slightly better rolling resistance (equivalent to the Pro2 lights). Supposed to be equal in flat resistance. If true, will probably become the new 'go to' tire.
More expensive, but a nicer feeling compound (not so slimy and grippy) and it comes in a new set of colors. I test rode a pair a few months ago and am definitely switching up from the Pro2's.
Have them on my new bike. They roll great but that may be the Ksyrium Elite wheelset they are mounted on They do feel a little stickier to the touch. Like Jeepfleeb, check back in a couple weeks after I have a chance to put more miles on them.