After being proven with SRAM's XX component group, 2x10 drive trains are here to stay. SRAM opens up their 2x10 technology to the X9 level. The X9 front derailleur shares the same design as the top shelf XX unit but tweaks the recipe of materials to lower the cost to help make 2x10 drive trains accessible to those whose race budgets come out of their own wallet.
I bought this front derailleur as part of an upgrade group for a new cross frame that I built up and it works great. The shifting is crisp and reliable and the quality is top notch, just like the rest of the SRAM group.