Foam cores can't hold up to the impact that a woodcore can.
Foam cores are marginally quicker, and only in instances when the ski is lighter at the tips, which now in many cases wood cores are just as light or lighter than a ski such as the teneighty. Sidecut and stiffness determined quickness far more than weight anyway.
Foam cores kill foam monsters. Foam monsters are a valuable part to any nations economy and without them, you couldnt have foam insulted coolers. So unless you don't like foam insulated coolers, dont buy a foam cored ski.
Are foam cores as bad as people say they are on this site?
No, not even close?
Are foam cores beter for freestyle/big mountain skiing?
No, they arent because it involves far too much impact and they lack the resistance to that type of force. Im sure at some point the technology will be improved, but right now its just not there yet.