i'd like to give it a shot
the thing that bothers me about the gpm inserts is they are vague about them. kyosho lists thiers as soft and hard so you know what your getting and you can tweak the settings. from the eb@y auctions i've only seen the monster radials liast as "with foam inserts."
all i know is i would rather have the raidal tires since my monster see's more time indoors than out. also since i have my track the radials woudl provide better performance, i hope.