I like my E3630A, but it is only one of a stable of bench power supplies. The advantage of a triple supply is that you can turn all three supplies off and on together, and being an HPAK design they won't do stupid glitchy things while coming up & going down. They have a common 'ground' terminal which makes wiring up to the UUT easier. I find the adjustability is OK, but then I'm not going to be using this as a substitute adjustable precision voltage source. The fixed current limiting means that I probably won't be using it for 'first power' applied to a new & untested circuit containing expensive and vulnerable parts, but really the ~0.6A limit on the ±20V supplies is pretty safe for most things. The compact size is also nice.
Most recently I have been using it to simulate a 12V lead-acid battery while developing a battery protection circuit, and the adjustability was fine for playing around with the turn-off & on thresholds (about 11.0V and 12.3V). Its real sweet spot is powering up little the development boards/modules that are known to work but don't come with a PSU. It would be perfectly OK as a beginer's first PSU though.
If the display doesn't turn on at all, before sending it back, open it up and check that the cable from J1 on the main PWA (next to the meter control pushbuttons) to the display module is correctly plugged in at both ends. It may just be there is no 5V reaching the meters.