The design goal was not to use expensive or extreme parts and the performance should be quite outstanding! If you look at technical data maybe you agree. But remember one thing: This power supply is designed to work with known loads. It can be used for any application which needs quite supply voltage. There are also lot's of room for tweaking and trimming and alternative parts such as standing smoothing caps (which are substantially more expensive than the blue BC Components). I have made options for more current and power. You can also change both opamps and voltage reference. The pcb is now made of real thick copper, around 95 um or 2.7 oz.