I also have the Hella 500's on my ARB. Personally, I haven't been terribly thrilled with their long term durability. The white plastic covers are crap, I have broken many of them. Both of my lights have condensation/fog in them and one of them is even rusting on the inside. They are OK in the brightness, but not nearly as nice as my friend's KC Daylighters. But hey, what do you want for $60/pair, right? I think I will try KC's next time.