Our real-life over one-year study of a switch from isCGM (FreeStyle Libre version 1) to rtCGM (Dexcom G4), without changing the insulin therapy management, reports an overall glycemic benefit, despite a rise in hyperglycemia metrics comparatively to mid-time follow-up, highlighting the interest of such therapeutical option in specific patients having a suboptimal diabetes control. Here, INS is linked to Hyperglycemia.