Thanks for taking your time to reply.
I was expecting a different answer though, being used to other sections of this forum.
I actually used one of these (an unbranded one, same thing did sell under many names) and my first reaction was to toss it out the window. Had to take it apart because of one apparently dodgy connection from the PSU board to the front panel. Problem solved after unplugging all the connectors and plugging them back in.
Voltage stability seemed ok at first, until you power it up the next day without touching the knobs. Had it set to 9V only to find out it outputs 10V next time it's powered up. I wouldn't power anything that doesn't accept a wide input voltage.
Current limit adjustment is off by quite a bit, something to be expected as the input offset voltage of the 741 is not quite small.
The circuit inside is very basic, 80's style. Two 741's for each channel, on handling the CV loop, the other for CC. Transformer tap switching is done using a LM324 powered through a 7812 if I remember correctly. Two TO-3 NPN transistors used for the series pass elements.
Build quality is awful, the whole thing looks like thrown together in a rush before probably being wave soldered. Took a few pictures while I was trying to fix the problem with one of the channels (the one with the dodgy connector contacts).
At the moment the only use I see for this is a large, heavy and expensive paperweight, at least I didn't pay for it. I'll be getting a better power supply, one channel only, digitally controlled in about two days, a much better choice for development.