I have the first version CED that is about ten years old. I had not used it for about four years and when I started shooting again this past spring I was having many problems of shots not recording. I soon started researching the web and decided to buy the IR screen kit and try that. Sometimes the shots would record and sometimes not. I thought the light conditions was the problem at the range because the sun was always extremely bright. At home I set it up did the rubber band and flashlight test and everything worked ok. Back to the range I go and this time nothing. Not even one shot would record. Last of all I decided to get a set of the new M2 sensors and try that. Result that did the trick. Every shot has recorded since it has not missed a beat. I had read that the M2 sensors where made better than the first ones and that's for sure. I hope if there is anyone out there having the same problems this may same them some time and grief. Mike