The Dexcom arrived yesterday and if you read my older post, I said that I was going to wear the first sensor. My daughter inserted it on me (arm) and while I wouldn't call the insertion painless, it wasn't that bad. I was impressed that once it was in, I couldn't feel it - even when I pressed on it. I think I felt the tape when I moved my arms more than anything. It was a bit of a bumpy start because I couldn't get the sensor to warm up. It would go out of range after 10 minutes and never come back in range - then we figured out we entered the wrong tansmitter number. Oops. Thanks to this board, I knew I could just stop the sensor and restart it, so I restarted it 2 or 3 times, then when we figured out the issue we stopped, changed the transmitter number and restarted. All was good and no calls to technical support. I only got to wear it for about 14 hours. This morning my daughter was looking at my overnight graph and she was itching to get it on herself. So, at 8:15a.m. I took my sensor off and she put on a new one - it should be ready to be calibrated soon. I told her she could look at it, but not to rely on it at all today, not to do anything different at school because of it and to do nothing with any of the alarms besides turn them off - especially after eating - and we would come up with a plan tonight. We'll see how it goes But my "waste" of a sensor really seemed to help. It helped me see that it doesn't hurt that bad (and not at all once it's in) and it it helped her want to wear it. Win-Win.