These guns are like seatbelts...I don't want different grade seatbelts. I want a seatbelt that works. If a company sells seatbelts that WILL work and seatbelts that SHOULD work, that doesn't seem very honest to me.
I would rather buy from a company that holds all their products to the same high standards. That's my personal opinion.
With that said, the upgrades can do nothing but help the function and reliability of that Stag.