I very much second that question. However, I would like to further develop it a bit.
Although most fit indices are not available or reliable for multilevel SEM, there are some good suggestions like those rfom Yuan and Bentler (2007) and Ryu E., West S. G. (2009). Considering that xxM is specifically intended for multilevel SEM, I am also wondering whether it already implements any of these state-of-art fit indices or an other solutions I’m not aware of. That’s by the way the most important incentive for me to move towards using xxM.