Having less than 100 hrs. on my RV-14A my CO detector gave up. I received a call asking if I wanted to purchase another one at a discounted rate but with less than 100 hrs. on the original one I declined. I asked if they had determined the cause of the failure and they answered premature sensor failure. Sounds like a defect to me, but oh well. Is this a detector's standard life one can expect or am I the unlucky one? These things are quite pricy for what they are but I'm not prepared to purchase one every year. They are supposed to last five years then they need to be re-calibrated and that is bad enough. Cessna's have flown for years I guess I'll have to agree with a Cessna freak" if it's good enough for Cessna it's good enough for me"