So you can use both at the same time? From AT website I got an impression that you can only receive data on one device, not on both. If you can have it on both, that would be cool. Otherwise, it would make the receiver useless for me
You can use one, the other, or both.
You can also share your data with other people (although i believe that was already availabe with the g4).
The Dexcom Clarity app also generates a .pdf that is really cool. It's a two page document that shows your average glucose levels over the past 14 days, your estimated a1c, how many manual calibrations you do per day, how often you're out of range, etc.
I'm sure the last two were already available with the G4 system, but it's definitely a feature that makes either system (G4 or G5) worth it.
For example, mine tells me:
Estimated A1C: 5.8
Average Glucose 119 mg/dl (6.6mmol/l)
Average daily calibrations: 3.0
Time in range (80-200): 92.5%
Time High (above 200): 6.4%
Time Low (below 80): 1.1%
Best Glucose day: In range 100% of the day
It also shows a graph that charts trends:
-7am and 7pm are the two peak times in the day for me (around 130-140 mg/dl)
-10am and 5pm are the two lowest times in the day for me (around 90 mg/dl)