Nice find!
I have some Cariloha boxer Briefs and bought these because of the price difference. These are a 5-Star Product at 3-Star shipping (hence the 4-star rating) - I must have purchased when FBA was out of stock, I think it shipped from China.

The product itself is VERY good. The legs do not ride up and the support is good. Compares very well to Cariloha.