My DP832 + HiRes add-on just arrived the other day. So far I am very impressed with the overall build quality.
Ease of use is my only complaint so far (which I sort of expected). Using the buttons surrounding the rotary knob is unintuitive and even difficult (finger keeps hitting the wrong buttons). Channels 1 and 2 are isolated and can be placed in series to increase voltage, or parallel to increase current, but there is no internal relay for doing this, which means an extra two wires are required to physically connect the banana jacks. Not the end of the world, but it would have been nice.
It isn't as accurate as I was hoping for; in fact mine doesn't even meet its specification at certain values, but it is still good enough for the types of things I'll be using it for; and with the HiRes add-on, I can make fine adjustments to the output.
Honestly, there isn't much to power supplies, but so far I am happy with this one.