I have not used these yet, but first impressions are favorable. The fit is roomy but not baggy and legs taper nicely. The material is thin packs away nice.
My only concern would be the inseam length. I am 6'1" /210 lbs and the XL fits nice, though I expect to have some gaps between pant hem and shoe top. Definitely refer to the Bellwether sizing chart, and suggest you err on the larger size.