im running a 525 did vx2 I think. Wasn’t the cheapest, or the best, but I’m at about 12000 km now I think. Replaced front and rear sprockets at the same time and they seem ok still. They may have been supersprox steel from memory. I’m doing an experiment on how many km’s I will get with zero maintenance, except to check tension. It had some big camp loads in that time as well. Probably up to 50kg loads. Full disclosure it has been cleaned and lubed once after a muddy sand ride early on in its life. Then I just thought, lets see what happens if I do nothing. A 150,000 km plus on my harley belt has made me lazy. Chain seems still ok but my oem one was fine and then died in about 1000km. Was fine and then it wasn’t. I looked after that one. Cleaned when I had to and lubed when needed. I expect this one to die a sudden death at some stage as well. my oem chain lasted around 20,000km from memory. This time I’m embracing the lazy in me.