I can't vouch for iRoad will mess up the lens as i don't park open air, and at most only during early morning hours 6-8am when I'm out at the gym.
However, iRoad has this inherent issue after a few years, the internal timing chip will go off and the time will no longer be accurate. Mine is about 3 years before I had to swap a new set. Was on the X9 and swap to FX2 Pro last year because of that. I was lazy to go get a refurbished set from iRoad SG since it's an inherent issue. Previous car also same issue. Changed 2-3 times, including auto-reboot ocassionally.
Apart from that, I'm pleased with the quality, given it's a few hundred, take it as depre over 3 years, negligible. The battery pack didn't last as long as well, mine was barely 2 years in when it lost power, couldn't sustain parking recording when it was supposed to for 40 hours.
That said, these are all expendables and consumables, nothing lasts forever under prolonged usage and exposure to natural elements.
Last gripe is the security flash, the LEDs tend to loose colour at the ends while the center ones usually stay bright, but oh well...