How are the power tarnsistors connected to the heatsink? Do they solely reley on the springyness of the component leads? I see no screw and no clamp. And heat conductive glue doesn't relly work with silcone sheets...
On the constant current issue: Yeah, thats a big problem. It always has been. In my last workplace we destroyed several 10th of tousands of dollars of chips just because some Hameg/R&S power supply was overshooting or otherwise misbehaving. Extremly annoying!
Also, at least for the HMP4040, from time to time it misses SCPI commands, so you always have to read them back and check. The virtual com port those things provide for communication disappears on every major windows update and you have to reenable it in the driver settings... (Try explaining to the IT staff why you need admin rights on that computer because of some power supply you want to use.)
Yeah... those things are nice spec wise but the usability is just such a pain. I found myself biting the table out of frustration many times. It's really sad and it has been so for years. The R&S RF gear is really nice and spot on, but what they bought in from Hameg - no improvement whatsoever since they aquired the company. Really doesn't add to well to their reputation.
PS: I would still take it for my home lab. Now that I know all their bugs and can circumvent them... ;-)