The first thing that comes to my mind is fantastic accuracy! We had a few problems the first 5-6 hours with ??? but after that it has been really spot on with differences no more that 10 points from his meter. In the end it was really easy to put it on and both my husband who tried it first and my son said that insertion was almost pain-free. However from day one we had problems with the adhesive it keeps coming off. With my husband we didn't have this problem. Could it be that he had a hot shower just after we put it on? I don't know. The only down side for me is that the sensor is bulky. This is the only complain my son also had, that it sticks out too much. For this reason only he is not repaired to use it 24/7 but selectively and I do understand him, though these two days he had it on were the ones in a looong time that I didn't wake up to meassure his bloodsugar! Bliss!!