I have ran RB carb and a GO and i will sy the RB is easier to work with for shure. But about the engine making more power and internals lasting longer IDK. I think that if you got 2 new mills 1 stock and 1 with X carb instead anything that would happen different would be that the person not having the best handle on tuning the GO carb thats it. I am better at Nova OS based carbs too but I am making it a point to use the stock carb on my newest mill because thats whats made for it so it should be the best for it. I have to say the only reason I even had gotten a RB carb was cause when heating my mill for break in I melted the stocker and I was able to get the RB for $20 off a buddy I was in a pinch and if that didnt happen I would have never ran another carb.