I use the Medtronic 670G and for 6 months I was in a clinical trial using the Dexcom 6 and the Tandem pump and not the 670. As soon as the trial was over, I contacted both Tandem and Dexcom. I LOVED THEM!!!
I do love it, but there are cons for the Tandem pump/Dexcom G6:
The belt clip is attached to the pump - it cannot be removed.
The pump insulin cartridge takes longer to fill than the minimed
The insulin cartridge has to be changed while 9 units remain unused
The packaging is obscenely large
Pros of the tandem pump/dexcom 6G
No more finger sticks.
Modern look on the pump
Smaller than the MiniMed
Hope this helps.