I've only used one Trijicon optic currently, the accupower 1-4 and the illumination has gone haywire, it will need to be serviced so I'm not happy about that. How's the quality on the ACOGS with tritium / fiber optic illumination? I assume at some point like 10 years into ownership that maybe the tritium needs to be serviced? Any other known long term issues with ACOGs?