While the Vibe provides a display for a Dexcom G4 sensor, it’s software is one generation back from the latest 505 or Artificial Pancreas Project software. I would be concerned with being locked into 2014 software for the service duration of the pump. I could be wrong but I don’t think it’s possible to update the Vibe G4 CGM.
At this point in the Dexcom CGM development stream, with the G5 just out and the G6 slated to come out next year, I think it’s a disadvantage to get frozen at the pre-505 G4 version level for up to four years. The Vibe G4 is an adequate CGM system but I would feel left behind as the Dexcom CGMs enters an improvement growth spurt.
I think commitment to Dexcom/pump integration at this time (be it Vibe, t:slim, or O’pod) may leave you behind imminent technical advancements.