tnk's are the shit.  super wide underfoot, really stompy.  they don't have a lot of sidecut, so they track really well off jumps and do exactly what you want when you're riding fakie.  they're stiff too (between the stl and msp in stiffness).  i can't speak about the edges being weak, but i didn't think they looked too thin.  anyway, sick ski for park usage, you definitely won't be disappointed.