Quality and fit is great. I like that newer oversized 100% cotton shirts, I went with a 2XL. I normally run 2XL or 3XL in the cotton/poly blended Ts, and sometimes they are a bit too fitted around the mid-section, the oversized has some extra room. I'm 6'3"/240 lbs.
For comparison they are like the classic Carhartt pocket tees. The 2XL GBRS shirt fits similar to an XL Carhartt loose fit work shirt.