That is a personal decision as to whether the upgrade is significant. For me the Noble 4 is a substantial upgrade in build and sound quality. For others it may not be. I will say the 272 is a great value for what you get. We all have reasons for why an IEM is good or bad. These reasons do not translate between people. I would say the Noble 4 costs more to manufacture than 272 based on specs and build quality as well as accessories. Each company is not going to release the actual costs though.