I own three Mastec regulated variable DC power supplies and they all work fine for my needs. I like the backlit LCDs on the latest HY1803D, which makes it easier to see and to remember I left it on.
The HY1503D unit you linked to I have not used yet, the price is right, the fine/course adjustment knobs look useful and the display looks nice.
What is better than an Arduino? An Arduino with a laser!