Well I didn't buy the RX-580 for mining, I bought mine at the end of March, I just wasn't happy with the general performance so got a refund a week later.
Well I have been saying drivers are very very important. Low and behold.... Almost as good as the driver from Oct 2011. I'd expect something like that after Vega though.
Just installed without any issues. In fact they improved it somewhat. Older drivers used to mess with my audio settings after an uninstall/reinstall. Just uninstalled this and installed and it didn't touch any of it. No more fiddling around