I use my M70 with Maya all the time, and I have been quite impressed with it's capabilities. Granted it's not as powerful as a monster AW system with a full P4, but it definitely gets the job done. Plus the 2.5+ hours of battery life (and 7lb weight) of the M70 more than make up for any power deficit. The Quadro is great; I've never had any trouble with lag when I'm using high poly models or extremely high numbers of particles. The render times with mental ray are quite comparable to my desktop system (I almost exclusively use the final gather function of mental ray for my rendering). I love the M70, and I can't recommend it enough.