They also make your feet absolutely ripped. I bought a pair from Vivo Barefoot a year and a half ago and they took about a month to not be tiring to walk in. I felt muscles in my feet I didn't know existed, and now my feet are the most vascular part of my body and look like I do some crazy for specific exercise. I can't wear normal shoes anymore because my toes feel cramped, not being able to feel the ground feels weird, and I feel like I'm gonna slip way more because I can't "grip" the ground with my foot.
My back doesn't hurt from walking anymore. Highly recommend, but you gotta give yourself a month to get used to them. Many barefoot shoe stores do 90 day returns no questions asked to give you time to adjust.
Because a more expensive PSU does not mean a better one. The efficiency ratings also don't tell the whole story as power supplies are more complicated than their power efficiency. Use one of the many power supply tier lists to ensure you get a good, reliable PSU. I've seen some very expensive ones be absolutely awful.