I started on the 670g a few months ago too. Early on I was really happy with the smooth BG readings. Unfortunately I can’t get the hang of Medtronic’s CGM. In my opinion, Dexcom’s sensor is easier to use and has a wider range of accuracy, although both seem less accurate with higher BG’s.
I’m currently without any sensors because I had several instances of sensor failure, so i used up my allotted sensors earlier than I should have. Sooo, right now my 670g is just a pump, no closed loop. I should be getting new sensors soon. I’m switched insurance companies this month --hopefully that doesn’t slow down the approval process too much. I will be contacting my rep for more training with the sensors, but at this point I’m ready to give up, use the 670 as a plain pump and go back to Dexcom’s CGM.