ai prime hardware

Whererever I read online, I seem to run into stories of AI primes lenses melting, fans breaking, overheating. I understand that it's a popular light, so there's gonna be plenty of happy customers, as well as plenty of "this broke on me" customers, but I'm trying to understand what the consensus...

I bought a near new AI Prime 16HD reef light from a friend $150.00 good buy right the only thing was missing was the 2 inch Nylon/Plastic mounting screw that holds the bracket to the tank that i can't seem to find anywhere Home Depot, Lowes etc ... I even went to auto parts store still could not...