Depends on how severe offroading you want to do.
If you just want to drive on dirt, it should be fine. For a while I had a m03 rally(lengthened shocks, rally tires and tl01 arms) and it worked very well in the dirt. Only thing that went wrong was the crappy duratrax "teflon" shieled bearings got dirt in them and became crunchy.
http://www.youtube.com/watch?v=5IOYHLgZM0I
http://www.youtube.com/watch?v=O0jVVx_dMfc
The df03ra would be better if you want to drive in grass too.