I've always worn briefs, so I thought I'd give these a try.  They fit as expected, but I was surprised when the waist actually sat at my waist!  But I imagine that the reason they are made that way is not so much for proper fit, but because there is a large market out there who wear their pants on their hips and the KAYIZU logo will be on prominent display.  Irrespective of the marketing motive, I was impressed; even work clothes makers who advertise "sits at the waist" have no idea where a person's waist is.

I love the blue color; the grey not so much; and black is black.  Can I order all blue?

I'm not sure about the legs riding up however and it appears to depend on the pants I am wearing.  A rough work pants makes the legs accordion up, much better than rolling up, but still  Dress pants don't cause this.  I'm guessing it's caused by the finish of the pants.  All in all my first foray into Kayizu has been pleasant.  I'm waiting to see how the longer waist and legs do in the summer humidity.