The attraction to 500 units is often to do with the price, and I think many people skimp on quality with the housing rack. I can understand that, and didn't want to pay for an API or RND housing. I also didn't want DSubs on the back, since buying new cables didn't appeal to me either.
Still, I didn't want to have the experience so many people have with the cheaper stuff, where things stop working or sound wrong due to being underpowered. So I chose this one.
It came really well packaged, was easy to set up, feels solid.
Im not crazy about the bright green lights when its exposed, but I have panel covers and that solved that.
Great balance of quality and price, would buy it again.