I used a number of the XL-2 thru XL-2G panels and found them to be very long term stable. I also have a few XL-4s in service still. Can't really recall an major issue with any of them.
I have had a couple issues with XL-31s however. Several of them worked fine with 4x2, but would refuse to recognize the kissoff when using CID causing run-a-way reporting. I also had a number of them start to lose programming and have to be re-uploaded periodically. I do still have a number of them in service.
Its been a looooong time though since they were eaten by Ademco. They continued to support the line much longer than I thought they would.
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