No Qutest here but I have a Weiliang 15W 5V linear power supply here (also sold on Aliexpress) which is very similar to the LHY mentioned by lanx0003 in the above post. I also have a couple of Sengterbelle 50W 5V R-Core power supplies here and they are a major step up in performance to the Weiliang for what it's worth and still quite inexpensive. Probably around $100-$110 U.S.
I use a high quality shielded power cord (also from Aliexpress and very inexpensive) with both of these to power a Topping E30 MK II dac and and Wiim Pro Plus that feeds that dac. And a couple of upgraded DC cords that came in around $25 U.S. each.
The second Sengterbelle was a recent acquisition and replaced the Weiliang on the Wiim. It was a pretty major step up in performance there, just as it was on the dac.
Highly recommended and a pretty major bang for the buck IMO.
There's also a review of the Sengterbelle Linear Power Supply on youtube for anyone that might be interested. It's a dual output version there; I'm running 2 separate single output versions and the one I have has a voltage display on the front panel but is otherwise quite similar to the one in the youtube review below.
I believe there are some comments in the youtube review suggesting that there is a hi fi dealer in the UK selling the Sengterbelle at around 400 British pounds which is about $500 U.S. Not sure if that's the case but I've seen similar Ali merchandise (power cords for example) being resold here at substantially higher prices by dealers so it would not surprise me.
https://www.youtube.com/watch?v=o7Unni0ny3o