From the SRAM Website - "The benefits SRAM 2X10 delivers—a full range of usable gears, less weight, and easier and smoother shifting in all terrains—are becoming understood by riders of all levels, not just cross country pros. To fully appreciate how SRAM 2X10 can help you make the most of your ride, we wanted to provide a comprehensive resource for all the facts, figures, and opinions about 2X10, the role of Truvativ's X-Glide technology, Exact Actuation and all the benefits of a 2X10 drivetrain for every kind of riding"

Grannygear has been on SRAM's 2x10 XX for some months now and while controversial, it flat out works.  Now SRAM has a dedicated 2x10 website

2x10 is here to stay and 2011 will be the year of the 2x10 expansion into Shimano off road drivetrains as well.  It is a brave new world.