If you want your CGM to automatically control the infusion of insulin based on your “actual” BG level, you have no choice but to pair up the Medtronic 670G Pump with the Guardian 3 sensor. Since switching from the Medtronic 530 to the 670g linked system, my A1c has improved from 7.8 to 7.2.
After a six month lurning curve, I have significantly reduced the number of annoying alarms. However, in my situation, the capability to monitor and maintain appropriate BG levels automatically, far out ways the annoying alarms.