I have nothing but rave reviews for the G4. It has been so much more accurate than the 7. I love the range. I put it on my nightstand at night and getting more sleep than ever!! But these sensors do no stay on nearly as well. I don't think I ever had a Dexcom 7 sensor come off before 7 days, and we usually stretched it to 10 before taking it off ourselves. But Charlotte has had several G4 sensors come off before day 7. About day 5 or so I have to put liquid skin tac all over it and lay the edges back down, which makes a sticky mess all over. It's really annoying. Does anyone else have this problem?