Update 05/24/2018:
Separatec customer services reached out to me and sent me one size smaller (medium) to try out to see if it would address my issues with the large size.

I am happy to report that the medium is a much better fit for me and that the legs also fit better. The only drawback still is that the legs still tend to ride up with time and use from getting up and sitting down. Aside from that they are the most comfortable piece of underwear I own, but due to the riding up I only wear them a few times a week and probably won't use them every day.

Original Review:
Reading the rave reviews for this product and all the positive comments I decided to give these a try.

Pros:
* Excellent material (micromodal is so soft)
* Separate pouches are a great concept

Cons:
* Sizing runs a bit large for the waistband (creates plumber butt)
* Tends to ride up the leg throughout the day

I am 6' 3", 38 inch waist, and about 220lbs. As such I went with a large size based on the size chart (though in my Haynes I wear mediums). I found that while initially the underwear feels great with use from standing and sitting the waistband would ride down and the legs will ride up. The worst it got was when I somehow fell out of the pouch and had to walk with my manhood squished to the side.

I tried them on with the tags still on for some time and was really going back and forth if they would work and thought that based on the other reviews of them running too small that this must be what they are suppose to fit like. I was wrong. Tags are off and have been washed so too late to return or exchange.

I will likely try these again in a medium size to see how they do, but I would not really recommend them unless you have different sizes to compare. I should have ordered a medium with the large to compare and see which fit best.