[ALL] XB6 Question

I just upgraded to the 300/20 connection thru Shaw with the new XB6 modem. I'm wondering if the modem's nat functionality is fast enough that I can retire my aging pfSense firewall and use the modem instead.. I'd like to cut down on running hardware if at all possible. I havent run into any performance issues as of yet.. but ive only had it for a few hours :) James Z