I am very impressed with this system. Being this is a gas piston upper, the cost to swap a barrel is far less than a complete assembly.
If cost were not an option, two dedicated assemblies would be better so to not effect POA/POI. For the person who can only afford one piston upper and one nice sight or optics set, this is ideal. Only concern I have with any "unique" AR, is the fact that parts are now none standard and Ruger is not free flowing with parts availability.