We made the switch from Navigator to Dexcom 7+. We just finally gave up on the Navigator sensor alarms waking us up at night and Jake's body seemed to be rejecting the new adhesive on the new enhanced sensors (and he hated the insertion process!) Yesterday we got trained on the 7+ and inserted one in the arm. Two hours later we had the ???. THen we started with seeing sensor error 1. Then we pulled out the sensor last night and the tip was bent at 90 degrees. I believe the tip-bent may have been user-error and we will try it again today. Our rep tells us that the arm is not approved and he has no experience with insertions on the arm and that the warranty on the senor is void if we use it 'off label' and on the arm. I've read about many of you who use it on the arm. Did your reps/trainers recommend and/or approve you using it on the arm. We cannot use stomach or back hips bc we want to save that space for Jake's pump (Jake is a thin, muscular 12 year old). Please share your arm experiences with me. Do you have any suggestions? I have 30 days to decide if this will work for us before the return period is up! Thanks!