Really like the boxers. Fit great everywhere. I'm used to wearing wool, mostly Icebreaker, since I lived in New Zealand for over a year (returned Mar 09). Currently, I have two different kinds of Icebreaker boxers as well. I think these SmartWool fit better and are made better with one qualifier.
My only issue is quality control. I purchased two pair. Two different colors. The waist bands where noticeability different (could feel the difference) so I measured them. One was 1 1/2 inches bigger in circumference (un-stretched) than the other. The larger one fits me better. So it makes me hesitant to purchase anymore... or maybe buy only one more pair to see if I just got one pair that was made wrong.