Yes it is, I got the minimalist spigot after I bought the chassis, and it does make more stable. I did get the Hook cover over the bag rider. It lets me hold on and support the back better with the Armageddon Gear X bag that I use.
The next upgrade is going to be the Tool-less Buttpad Height Mechanism, but I was not sure if the polymer version would hold up with hunting, so it is good to know that it does.