I have the anvil II. at 400 grams, shifting has benefited from the added weight.
I've swapped back to the stock shifter and back to the Moddiction knob a few times, mostly for when the car is being serviced (as they do not warranty if things inside the car go missing)... so i do appreciate the slight differences the anvil II provides. Now having the Anvil II, i would say i would like to try the Anvil which offers more surface area to shift with. The Anvil II is nice but having more grip might be something that would offer more benefit to the added weight.