Well Atrocities .I built one In stock se4gold,AI diffuculty Medium ,turn base game, 25% Left to discover in unknown systems,1st place. By the time i built one and a few facilitys on it, made it my major Hub for ships,the game was mostly over,I pretty much destroyed all but 1 or 2 Ai empires

.Never had a chance to see what benefite this ringworld can do.Note: I never built a Sphereworld yet.