The "not working at all" should not really be a poll choice. If it isn't working at all when the customer got it, then that unit will be replaced under warranty. If it got damaged, then it can be repaired. The interesting part is to know how the unit performs, when it isn't damaged for any reason.
That said, I'm quite happy with my DP832A, but I'm not really pushing it to the its limits. So my response to your poll was "works most of the time, with only minor issues". The minor issue being the loud fan, and the software that comes with it is practically unusable. Just like Keysight's shit, it installs truck loads of software on the PC that keep running in the background, but when you try to connect to it to set some parameters, it just doesn't work. There probably is a way to get it to work, but I sure won't bother ...
The main reason I got this was that it can be programmed. This was very useful for me when I was troubleshooting a DHCP issue on an embedded design I was working on. I basically programmed it to toggle the output power every 30 seconds so that the hardware reboot constantly and checks whether DHCP worked or not.