The black bibs ultimate seem well constructed and they fit really well when I tried them on. But about 45 minutes into my first ride with them I had some serious chafing from the seam around the chamois, and by the time I got home it had turned into a painful raw spot on my leg.
I didn't see anything wrong with the stitching so I think the placement of the seam just didn't work for me. I've never had this happen with other bibs/shorts so just something to watch out for.