I had to come back to this post and update. For the last 2 sensors (Enlite) I have done the insertion on the upper leg and have to say that the sensor is SUPERB: The first one lasted 10 days with not one single false low. Now the second one is 6th day and I am going to restart it to see how long more it will go for. But really very accurate, can depend on it almost 90% and NO FALSE LAW in the night. Yupiiiiiiiiiiiii. So at the end they are not bad ). Maybe its the site problem.