the gold sux. it might have been good 20 years ago but it doesnt compare to more modern fillers. i have used the xtreme and that was just ok. iwasnt bad but i wasnt impressed either. never used the ultra but have heard good things. i use the evercoat quantum. expensive but its really great stuff.
I loved the Marson Platinum before 3M bought them out. Just doesn't seem to be the same stuff anymore. When I finish this can I will try the Rage Ultra. Tried the Gold years ago but didn't care for it hence I switched to the Marson Platinum and have stayed there.